diff --git a/qucs/extsimkernels/customsimdialog.cpp b/qucs/extsimkernels/customsimdialog.cpp
index 664d6ecfe..b3b22904e 100644
--- a/qucs/extsimkernels/customsimdialog.cpp
+++ b/qucs/extsimkernels/customsimdialog.cpp
@@ -29,7 +29,7 @@
 /*!
  * \brief CustomSimDialog::CustomSimDialog class constructor
  * \param pc[in] Component that need to be edit.
- * \param sch[in] Schematic on which a_component presents.
+ * \param sch[in] Schematic on which component presents.
  */
 CustomSimDialog::CustomSimDialog(SpiceCustomSim *pc, Schematic *sch) :
     QDialog(sch),
@@ -119,7 +119,7 @@ void CustomSimDialog::slotChanged()
     a_isChanged = true;
 }
 /*!
- * \brief CustomSimDialog::slotApply Apply changes of a_component properties.
+ * \brief CustomSimDialog::slotApply Apply changes of component properties.
  */
 void CustomSimDialog::slotApply()
 {
diff --git a/qucs/extsimkernels/spicelibcompdialog.cpp b/qucs/extsimkernels/spicelibcompdialog.cpp
index 9552ec15d..e8e02820b 100644
--- a/qucs/extsimkernels/spicelibcompdialog.cpp
+++ b/qucs/extsimkernels/spicelibcompdialog.cpp
@@ -11,56 +11,74 @@
 #include "spicelibcompdialog.h"
 
 
-SpiceLibCompDialog::SpiceLibCompDialog(Component *pc, Schematic *sch) : QDialog{sch}
+SpiceLibCompDialog::SpiceLibCompDialog(Component *pc, Schematic *sch) :
+  QDialog(sch),
+  a_symbolPinsCount(0),
+  a_isChanged(false),
+  a_libError(false),
+  a_prev_row(-1),
+  a_prev_col(-1),
+  a_lastSymbolDir(),
+  a_lastLibDir(),
+  a_comp(pc),
+  a_Doc(sch),
+  a_symbol(new SymbolWidget),
+  a_edtLibPath(new QLineEdit),
+  a_edtParams(new QLineEdit),
+  a_edtSymFile(new QLineEdit),
+  a_edtSPICE(new QPlainTextEdit),
+  a_btnOpenLib(new QPushButton(tr("Open"))),
+  a_btnOK(new QPushButton(tr("OK"))),
+  a_btnApply(new QPushButton(tr("Apply"))),
+  a_btnCancel(new QPushButton(tr("Cancel"))),
+  a_btnOpenSym(new QPushButton(tr("Open"))),
+  a_tbwPinsTable(new QTableWidget),
+  a_cbxSelectSubcir(new QComboBox),
+  a_listSymPattern(new QListWidget),
+  a_rbSymFromTemplate(new QRadioButton(tr("Symbol from template"))),
+  a_rbAutoSymbol(new QRadioButton(tr("Automatic symbol"))),
+  a_rbUserSym(new QRadioButton(tr("Symbol from file"))),
+  a_chbShowLib(new QCheckBox(tr("Show"))),
+  a_chbShowModel(new QCheckBox(tr("Show"))),
+  a_chbShowParams(new QCheckBox(tr("Show"))),
+  a_subcirPins(),
+  a_subcirSPICE()
 {
-  comp = pc;
-  Doc = sch;
-  symbolPinsCount = 0;
-  isChanged = false;
-  libError = false;
-  prev_col = -1;
-  prev_row = -1;
-
-  QString file = comp->Props.at(0)->Value;
+  QString file = a_comp->Props.at(0)->Value;
   if (!file.isEmpty()) {
-    file = misc::properAbsFileName(file, Doc);
+    file = misc::properAbsFileName(file, a_Doc);
     QFileInfo inf(file);
-    lastLibDir = inf.absoluteDir().path();
+    a_lastLibDir = inf.absoluteDir().path();
   } else {
-    QFileInfo inf = Doc->getFileInfo();
+    QFileInfo inf = a_Doc->getFileInfo();
     if (inf.absoluteFilePath().isEmpty()) { // untitled document
-      lastLibDir = QucsSettings.QucsWorkDir.absolutePath();
+      a_lastLibDir = QucsSettings.QucsWorkDir.absolutePath();
     } else { // saved schematic
-      lastLibDir = inf.absoluteDir().path();
+      a_lastLibDir = inf.absoluteDir().path();
     }
   }
-  bool show_lib = comp->Props.at(0)->display;
-  QString device = comp->Props.at(1)->Value;
-  bool show_model = comp->Props.at(1)->display;
-  QString sym = comp->Props.at(2)->Value;
-  QString par = comp->Props.at(3)->Value;
-  bool show_par = comp->Props.at(3)->display;
-  QString pin_list = comp->Props.at(4)->Value;
+  bool show_lib = a_comp->Props.at(0)->display;
+  QString device = a_comp->Props.at(1)->Value;
+  bool show_model = a_comp->Props.at(1)->display;
+  QString sym = a_comp->Props.at(2)->Value;
+  QString par = a_comp->Props.at(3)->Value;
+  bool show_par = a_comp->Props.at(3)->display;
+  QString pin_list = a_comp->Props.at(4)->Value;
 
   QLabel *lblLibfile = new QLabel("SPICE library:");
-  edtLibPath = new QLineEdit;
-  edtLibPath->setText(file);
-  connect(edtLibPath,SIGNAL(textChanged(QString)),this,SLOT(slotFillSubcirComboBox()));
-  btnOpenLib = new QPushButton(tr("Open"));
-  connect(btnOpenLib,SIGNAL(clicked(bool)),this,SLOT(slotBtnOpenLib()));
+  a_edtLibPath->setText(file);
+  connect(a_edtLibPath,SIGNAL(textChanged(QString)),this,SLOT(slotFillSubcirComboBox()));
+  connect(a_btnOpenLib,SIGNAL(clicked(bool)),this,SLOT(slotBtnOpenLib()));
 
   QLabel *lbl_par = new QLabel("Component parameters");
-  edtParams = new QLineEdit;
-  edtParams->setText(par);
+  a_edtParams->setText(par);
 
   QLabel *lblDevice = new QLabel("Subcircuit:");
-  cbxSelectSubcir = new QComboBox;
-  connect(cbxSelectSubcir,SIGNAL(currentIndexChanged(int)),this,SLOT(slotFillPinsTable()));
+  connect(a_cbxSelectSubcir,SIGNAL(currentIndexChanged(int)),this,SLOT(slotFillPinsTable()));
 
-  listSymPattern = new QListWidget;
   QStringList lst_patterns;
   misc::getSymbolPatternsList(lst_patterns);
-  listSymPattern->addItems(lst_patterns);
+  a_listSymPattern->addItems(lst_patterns);
   if (lst_patterns.isEmpty()) {
     QString dir_name = QucsSettings.BinDir + "/../share/" QUCS_NAME "/symbols/";
     QString msg = tr("No symbol files found at the following path:\n");
@@ -68,114 +86,100 @@ SpiceLibCompDialog::SpiceLibCompDialog(Component *pc, Schematic *sch) : QDialog{
     msg += tr("\nCheck you installation!\n");
     QMessageBox::warning(this,tr("Warning"),msg);
   }
-  listSymPattern->setCurrentRow(0);
-  listSymPattern->setSelectionMode(QAbstractItemView::SingleSelection);
-  connect(listSymPattern,SIGNAL(currentRowChanged(int)),this,SLOT(slotSetSymbol()));
+  a_listSymPattern->setCurrentRow(0);
+  a_listSymPattern->setSelectionMode(QAbstractItemView::SingleSelection);
+  connect(a_listSymPattern,SIGNAL(currentRowChanged(int)),this,SLOT(slotSetSymbol()));
 
-  rbAutoSymbol = new QRadioButton(tr("Automatic symbol"));
-  rbSymFromTemplate = new QRadioButton(tr("Symbol from template"));
   if (lst_patterns.isEmpty()) {
-    rbSymFromTemplate->setEnabled(false);
+    a_rbSymFromTemplate->setEnabled(false);
   }
-  rbUserSym = new QRadioButton(tr("Symbol from file"));
-  btnOpenSym = new QPushButton(tr("Open"));
-  edtSymFile = new QLineEdit();
-  connect(btnOpenSym,SIGNAL(clicked(bool)),this,SLOT(slotBtnOpenSym()));
-
-  chbShowLib = new QCheckBox(tr("Show"));
-  chbShowLib->setChecked(show_lib);
-  chbShowModel = new QCheckBox(tr("Show"));
-  chbShowModel->setChecked(show_model);
-  chbShowParams = new QCheckBox(tr("Show"));
-  chbShowParams->setChecked(show_par);
-  connect(chbShowLib,SIGNAL(toggled(bool)),this,SLOT(slotChanged()));
-  connect(chbShowModel,SIGNAL(toggled(bool)),this,SLOT(slotChanged()));
-  connect(chbShowParams,SIGNAL(toggled(bool)),this,SLOT(slotChanged()));
-
-  if (QFileInfo::exists(misc::properAbsFileName(sym, Doc))) {
-    edtSymFile->setText(misc::properAbsFileName(sym, Doc));
-    rbUserSym->setChecked(true);
-    QFileInfo inf(misc::properAbsFileName(sym, Doc));
-    lastSymbolDir = inf.absoluteDir().path();
+  connect(a_btnOpenSym,SIGNAL(clicked(bool)),this,SLOT(slotBtnOpenSym()));
+
+  a_chbShowLib->setChecked(show_lib);
+  a_chbShowModel->setChecked(show_model);
+  a_chbShowParams->setChecked(show_par);
+  connect(a_chbShowLib,SIGNAL(toggled(bool)),this,SLOT(slotChanged()));
+  connect(a_chbShowModel,SIGNAL(toggled(bool)),this,SLOT(slotChanged()));
+  connect(a_chbShowParams,SIGNAL(toggled(bool)),this,SLOT(slotChanged()));
+
+  if (QFileInfo::exists(misc::properAbsFileName(sym, a_Doc))) {
+    a_edtSymFile->setText(misc::properAbsFileName(sym, a_Doc));
+    a_rbUserSym->setChecked(true);
+    QFileInfo inf(misc::properAbsFileName(sym, a_Doc));
+    a_lastSymbolDir = inf.absoluteDir().path();
   } else {
-    QFileInfo inf = Doc->getFileInfo();
-    lastSymbolDir = inf.absoluteDir().path();
+    QFileInfo inf = a_Doc->getFileInfo();
+    a_lastSymbolDir = inf.absoluteDir().path();
     if (sym == "auto") {
-      rbAutoSymbol->setChecked(true);
+      a_rbAutoSymbol->setChecked(true);
     } else {
-      rbSymFromTemplate->setChecked(true);
+      a_rbSymFromTemplate->setChecked(true);
     }
   }
 
-  symbol = new SymbolWidget;
-  symbol->disableDragNDrop();
-  symbol->enableShowPinNumbers();
-  symbol->setPaintText("");
+  a_symbol->disableDragNDrop();
+  a_symbol->enableShowPinNumbers();
+  a_symbol->setPaintText("");
 
-  tbwPinsTable = new QTableWidget;
-  tbwPinsTable->setColumnCount(2);
-  tbwPinsTable->setRowCount(100);
+  a_tbwPinsTable->setColumnCount(2);
+  a_tbwPinsTable->setRowCount(100);
   QStringList lbl_cols;
   lbl_cols<<"Subcircuit pin"<<"Symbol pin";
-  tbwPinsTable->setHorizontalHeaderLabels(lbl_cols);
-  tbwPinsTable->setMinimumWidth(2.2*tbwPinsTable->columnWidth(0));
-  tbwPinsTable->setMinimumHeight(5*tbwPinsTable->rowHeight(0));
-  connect(tbwPinsTable,SIGNAL(cellDoubleClicked(int,int)),this,SLOT(slotTableCellDoubleClick()));
-
-  edtSPICE = new QPlainTextEdit;
-  edtSPICE->setReadOnly(true);
-  edtSPICE->setMinimumSize(tbwPinsTable->minimumSize());
-
-  btnOK = new QPushButton(tr("OK"));
-  connect(btnOK,SIGNAL(clicked(bool)),this,SLOT(slotBtnOK()));
-  btnApply = new QPushButton(tr("Apply"));
-  connect(btnApply,SIGNAL(clicked(bool)),this,SLOT(slotBtnApply()));
-  btnCancel = new QPushButton(tr("Cancel"));
-  connect(btnCancel,SIGNAL(clicked(bool)),this,SLOT(slotBtnCancel()));
+  a_tbwPinsTable->setHorizontalHeaderLabels(lbl_cols);
+  a_tbwPinsTable->setMinimumWidth(2.2*a_tbwPinsTable->columnWidth(0));
+  a_tbwPinsTable->setMinimumHeight(5*a_tbwPinsTable->rowHeight(0));
+  connect(a_tbwPinsTable,SIGNAL(cellDoubleClicked(int,int)),this,SLOT(slotTableCellDoubleClick()));
+
+  a_edtSPICE->setReadOnly(true);
+  a_edtSPICE->setMinimumSize(a_tbwPinsTable->minimumSize());
+
+  connect(a_btnOK,SIGNAL(clicked(bool)),this,SLOT(slotBtnOK()));
+  connect(a_btnApply,SIGNAL(clicked(bool)),this,SLOT(slotBtnApply()));
+  connect(a_btnCancel,SIGNAL(clicked(bool)),this,SLOT(slotBtnCancel()));
 
   QVBoxLayout *top = new QVBoxLayout;
   QHBoxLayout *l2 = new QHBoxLayout;
   l2->addWidget(lblLibfile);
-  l2->addWidget(edtLibPath,4);
-  l2->addWidget(btnOpenLib,1);
-  l2->addWidget(chbShowLib);
+  l2->addWidget(a_edtLibPath,4);
+  l2->addWidget(a_btnOpenLib,1);
+  l2->addWidget(a_chbShowLib);
   top->addLayout(l2);
 
   QHBoxLayout *l7 = new QHBoxLayout;
   l7->addWidget(lbl_par);
-  l7->addWidget(edtParams);
-  l7->addWidget(chbShowParams);
+  l7->addWidget(a_edtParams);
+  l7->addWidget(a_chbShowParams);
   top->addLayout(l7);
 
   QGridLayout *gl1 = new QGridLayout;
-  gl1->addWidget(rbAutoSymbol,0,0);
-  gl1->addWidget(rbSymFromTemplate,1,0);
-  gl1->addWidget(rbUserSym,2,0);
-  gl1->addWidget(edtSymFile,2,1);
-  gl1->addWidget(btnOpenSym,2,2);
-  gl1->addWidget(symbol,0,3,3,2);
-  gl1->addWidget(listSymPattern,0,5,3,2);
+  gl1->addWidget(a_rbAutoSymbol,0,0);
+  gl1->addWidget(a_rbSymFromTemplate,1,0);
+  gl1->addWidget(a_rbUserSym,2,0);
+  gl1->addWidget(a_edtSymFile,2,1);
+  gl1->addWidget(a_btnOpenSym,2,2);
+  gl1->addWidget(a_symbol,0,3,3,2);
+  gl1->addWidget(a_listSymPattern,0,5,3,2);
   top->addLayout(gl1);
 
   QHBoxLayout *l3 = new QHBoxLayout;
-  l3->addWidget(tbwPinsTable);
+  l3->addWidget(a_tbwPinsTable);
   QGroupBox *gpb1 = new QGroupBox(tr("SPICE model"));
   QVBoxLayout *l8 = new QVBoxLayout;
   QHBoxLayout *l5 = new QHBoxLayout;
   l5->addWidget(lblDevice);
-  l5->addWidget(cbxSelectSubcir);
-  l5->addWidget(chbShowModel);
+  l5->addWidget(a_cbxSelectSubcir);
+  l5->addWidget(a_chbShowModel);
   l8->addLayout(l5);
-  l8->addWidget(edtSPICE);
+  l8->addWidget(a_edtSPICE);
   gpb1->setLayout(l8);
   l3->addWidget(gpb1);
   top->addLayout(l3,3);
 
 
   QHBoxLayout *l4 = new QHBoxLayout;
-  l4->addWidget(btnOK);
-  l4->addWidget(btnApply);
-  l4->addWidget(btnCancel);
+  l4->addWidget(a_btnOK);
+  l4->addWidget(a_btnApply);
+  l4->addWidget(a_btnCancel);
   l4->addStretch();
   top->addLayout(l4);
 
@@ -184,46 +188,46 @@ SpiceLibCompDialog::SpiceLibCompDialog(Component *pc, Schematic *sch) : QDialog{
   this->setWindowTitle(tr("Edit SPICE library device"));
   slotFillSubcirComboBox();
 
-  cbxSelectSubcir->setCurrentText(device);
-  auto items = listSymPattern->findItems(sym,Qt::MatchExactly);
-  if (!items.isEmpty()) listSymPattern->setCurrentItem(items.at(0));
-  //listSymPattern->setCurrentText(sym);
+  a_cbxSelectSubcir->setCurrentText(device);
+  auto items = a_listSymPattern->findItems(sym,Qt::MatchExactly);
+  if (!items.isEmpty()) a_listSymPattern->setCurrentItem(items.at(0));
+  //a_listSymPattern->setCurrentText(sym);
 
   if (!pin_list.isEmpty()) {
     QStringList pins = pin_list.split(";");
     for(int i = 0; i < pins.count(); i++) {
-      QTableWidgetItem *itm = tbwPinsTable->item(i,1);
+      QTableWidgetItem *itm = a_tbwPinsTable->item(i,1);
       if (itm != nullptr) {
         itm->setText(pins.at(i));
       }
     }
   }
 
-  listSymPattern->setMinimumWidth(0.75*tbwPinsTable->minimumWidth());
-  symbol->setMinimumWidth(0.75*tbwPinsTable->minimumWidth());
-
-  btnApply->setEnabled(false);
-  connect(rbAutoSymbol,SIGNAL(toggled(bool)),this,SLOT(slotSetSymbol()));
-  connect(rbSymFromTemplate,SIGNAL(toggled(bool)),this,SLOT(slotSetSymbol()));
-  connect(rbUserSym,SIGNAL(toggled(bool)),this,SLOT(slotSetSymbol()));
-  connect(edtLibPath,SIGNAL(textChanged(QString)),this,SLOT(slotChanged()));
-  connect(edtParams,SIGNAL(textChanged(QString)),this,SLOT(slotChanged()));
-  connect(tbwPinsTable,SIGNAL(cellChanged(int,int)),this,SLOT(slotChanged()));
-  connect(listSymPattern,SIGNAL(currentIndexChanged(int)),this,SLOT(slotChanged()));
-  connect(cbxSelectSubcir,SIGNAL(currentIndexChanged(int)),this,SLOT(slotChanged()));
-  connect(edtSymFile,SIGNAL(textChanged(QString)),this,SLOT(slotSetSymbol()));
-  connect(edtSymFile,SIGNAL(textChanged(QString)),this,SLOT(slotChanged()));
+  a_listSymPattern->setMinimumWidth(0.75*a_tbwPinsTable->minimumWidth());
+  a_symbol->setMinimumWidth(0.75*a_tbwPinsTable->minimumWidth());
+
+  a_btnApply->setEnabled(false);
+  connect(a_rbAutoSymbol,SIGNAL(toggled(bool)),this,SLOT(slotSetSymbol()));
+  connect(a_rbSymFromTemplate,SIGNAL(toggled(bool)),this,SLOT(slotSetSymbol()));
+  connect(a_rbUserSym,SIGNAL(toggled(bool)),this,SLOT(slotSetSymbol()));
+  connect(a_edtLibPath,SIGNAL(textChanged(QString)),this,SLOT(slotChanged()));
+  connect(a_edtParams,SIGNAL(textChanged(QString)),this,SLOT(slotChanged()));
+  connect(a_tbwPinsTable,SIGNAL(cellChanged(int,int)),this,SLOT(slotChanged()));
+  connect(a_listSymPattern,SIGNAL(currentIndexChanged(int)),this,SLOT(slotChanged()));
+  connect(a_cbxSelectSubcir,SIGNAL(currentIndexChanged(int)),this,SLOT(slotChanged()));
+  connect(a_edtSymFile,SIGNAL(textChanged(QString)),this,SLOT(slotSetSymbol()));
+  connect(a_edtSymFile,SIGNAL(textChanged(QString)),this,SLOT(slotChanged()));
 
 }
 
 void SpiceLibCompDialog::slotFillSubcirComboBox()
 {
-  QString libfile = edtLibPath->text();
+  QString libfile = a_edtLibPath->text();
   if (!QFile::exists(libfile)) return;
   int  r = parseLibFile(libfile);
-  libError = false;
+  a_libError = false;
   if (r != noError) {
-    libError = true;
+    a_libError = true;
     QString msg;
     switch (r) {
     case failedOpenFile:
@@ -240,31 +244,31 @@ void SpiceLibCompDialog::slotFillSubcirComboBox()
     return;
   }
 
-  cbxSelectSubcir->blockSignals(true);
-  cbxSelectSubcir->clear();
-  for(const auto &key: subcirPins.keys()) {
-    cbxSelectSubcir->addItem(key);
+  a_cbxSelectSubcir->blockSignals(true);
+  a_cbxSelectSubcir->clear();
+  for(const auto &key: a_subcirPins.keys()) {
+    a_cbxSelectSubcir->addItem(key);
   }
-  cbxSelectSubcir->blockSignals(false);
+  a_cbxSelectSubcir->blockSignals(false);
   slotFillPinsTable();
 }
 
 void SpiceLibCompDialog::slotFillPinsTable()
 {
-  QString subcir_name = cbxSelectSubcir->currentText();
-  if (subcirPins.find(subcir_name) == subcirPins.end()) return;
-  QStringList pins = subcirPins[subcir_name];
-  tbwPinsTable->clearContents();
-  tbwPinsTable->setRowCount(pins.count());
+  QString subcir_name = a_cbxSelectSubcir->currentText();
+  if (a_subcirPins.find(subcir_name) == a_subcirPins.end()) return;
+  QStringList pins = a_subcirPins[subcir_name];
+  a_tbwPinsTable->clearContents();
+  a_tbwPinsTable->setRowCount(pins.count());
   for (int i = 0; i < pins.count(); i++) {
     QTableWidgetItem *itm1 = new QTableWidgetItem(pins.at(i));
-    tbwPinsTable->setItem(i,0,itm1);
+    a_tbwPinsTable->setItem(i,0,itm1);
     QTableWidgetItem *itm2 = new QTableWidgetItem("NC");
-    tbwPinsTable->setItem(i,1,itm2);
+    a_tbwPinsTable->setItem(i,1,itm2);
   }
 
-  edtSPICE->clear();
-  edtSPICE->setPlainText(subcirSPICE[subcir_name]);
+  a_edtSPICE->clear();
+  a_edtSPICE->setPlainText(a_subcirSPICE[subcir_name]);
 }
 
 int SpiceLibCompDialog::parseLibFile(const QString &filename)
@@ -276,8 +280,8 @@ int SpiceLibCompDialog::parseLibFile(const QString &filename)
     return failedOpenFile;
   }
 
-  subcirPins.clear();
-  subcirSPICE.clear();
+  a_subcirPins.clear();
+  a_subcirSPICE.clear();
   QTextStream ts(&f);
 
   bool subcir_start = false;
@@ -300,7 +304,7 @@ int SpiceLibCompDialog::parseLibFile(const QString &filename)
       if (line.startsWith("+")) {
         line.remove(0,1);
         QStringList pins = line.split(QRegularExpression("[ \\t]"),Qt::SkipEmptyParts);
-        subcirPins[last_subcir].append(pins);
+        a_subcirPins[last_subcir].append(pins);
       } else {
         // end of header
         header_start = false;
@@ -325,19 +329,19 @@ int SpiceLibCompDialog::parseLibFile(const QString &filename)
           pin_names.append(s1);
         }
       }
-      subcirPins[subname] = pin_names;
+      a_subcirPins[subname] = pin_names;
     }
     if (subcir_start) {
       subcir_body += line + "\n";
     }
     if (line.startsWith(".ENDS")) {
       subcir_start = false;
-      subcirSPICE[subname] = subcir_body;
+      a_subcirSPICE[subname] = subcir_body;
     }
   }
 
   f.close();
-  if (subcirPins.isEmpty()) {
+  if (a_subcirPins.isEmpty()) {
     return noSUBCKT;
   }
   return noError;
@@ -347,40 +351,40 @@ int SpiceLibCompDialog::parseLibFile(const QString &filename)
 void SpiceLibCompDialog::slotSetSymbol()
 {
   int result = -1;
-  if (rbAutoSymbol->isChecked()) {
-    tbwPinsTable->setEnabled(false);
-    listSymPattern->setEnabled(false);
-    edtSymFile->setEnabled(false);
-    btnOpenSym->setEnabled(false);
+  if (a_rbAutoSymbol->isChecked()) {
+    a_tbwPinsTable->setEnabled(false);
+    a_listSymPattern->setEnabled(false);
+    a_edtSymFile->setEnabled(false);
+    a_btnOpenSym->setEnabled(false);
     QString s1 = "";
     QString s2 = "SpLib";
-    symbol->setSymbol(s1, s1, s2);
+    a_symbol->setSymbol(s1, s1, s2);
     result = 0;
-    symbol->setWarning(tr("No symbol loaded"));
-    symbolPinsCount = 0;
-  } else if (rbSymFromTemplate->isChecked()) {
-    if (listSymPattern->currentItem() == nullptr) {
+    a_symbol->setWarning(tr("No symbol loaded"));
+    a_symbolPinsCount = 0;
+  } else if (a_rbSymFromTemplate->isChecked()) {
+    if (a_listSymPattern->currentItem() == nullptr) {
       return; // empty list
     }
-    tbwPinsTable->setEnabled(true);
-    listSymPattern->setEnabled(true);
-    edtSymFile->setEnabled(false);
-    btnOpenSym->setEnabled(false);
+    a_tbwPinsTable->setEnabled(true);
+    a_listSymPattern->setEnabled(true);
+    a_edtSymFile->setEnabled(false);
+    a_btnOpenSym->setEnabled(false);
     QString dir_name = QucsSettings.BinDir + "/../share/" QUCS_NAME "/symbols/";
-    QString file = dir_name + listSymPattern->currentItem()->text() + ".sym";
-    result = symbol->loadSymFile(file);
-    symbolPinsCount = symbol->getPortsNumber();
-  } else if (rbUserSym->isChecked()) {
-    tbwPinsTable->setEnabled(true);
-    listSymPattern->setEnabled(false);
-    edtSymFile->setEnabled(true);
-    btnOpenSym->setEnabled(true);
-    if (edtSymFile->text().isEmpty()) {
-      symbolPinsCount = 0;
+    QString file = dir_name + a_listSymPattern->currentItem()->text() + ".sym";
+    result = a_symbol->loadSymFile(file);
+    a_symbolPinsCount = a_symbol->getPortsNumber();
+  } else if (a_rbUserSym->isChecked()) {
+    a_tbwPinsTable->setEnabled(true);
+    a_listSymPattern->setEnabled(false);
+    a_edtSymFile->setEnabled(true);
+    a_btnOpenSym->setEnabled(true);
+    if (a_edtSymFile->text().isEmpty()) {
+      a_symbolPinsCount = 0;
       return;
     }
-    result = symbol->loadSymFile(edtSymFile->text());
-    symbolPinsCount = symbol->getPortsNumber();
+    result = a_symbol->loadSymFile(a_edtSymFile->text());
+    a_symbolPinsCount = a_symbol->getPortsNumber();
   }
 
   if (result < 0) {
@@ -388,33 +392,33 @@ void SpiceLibCompDialog::slotSetSymbol()
     return;
   }
 
-  for (int i = 0; i < tbwPinsTable->rowCount(); i++) {
+  for (int i = 0; i < a_tbwPinsTable->rowCount(); i++) {
     QTableWidgetItem *itm = new QTableWidgetItem("NC");
-    tbwPinsTable->setItem(i,1,itm);
+    a_tbwPinsTable->setItem(i,1,itm);
   }
-  isChanged = true;
-  btnApply->setEnabled(true);
+  a_isChanged = true;
+  a_btnApply->setEnabled(true);
 }
 
 void SpiceLibCompDialog::slotTableCellDoubleClick()
 {
-  int r = tbwPinsTable->currentRow();
-  int c = tbwPinsTable->currentColumn();
+  int r = a_tbwPinsTable->currentRow();
+  int c = a_tbwPinsTable->currentColumn();
   if (c == 0) return; // do not edit the first column
 
-  if (prev_col >= 0 && prev_row >= 0) { // remove combo box from previous cell
+  if (a_prev_col >= 0 && a_prev_row >= 0) { // remove combo box from previous cell
     QTableWidgetItem *itm = new QTableWidgetItem("NC");
-    tbwPinsTable->removeCellWidget(prev_row, prev_col);
-    tbwPinsTable->setItem(prev_row, prev_col, itm);
+    a_tbwPinsTable->removeCellWidget(a_prev_row, a_prev_col);
+    a_tbwPinsTable->setItem(a_prev_row, a_prev_col, itm);
   }
 
   QComboBox *cbxSelectPin = new QComboBox;
   cbxSelectPin->addItem("NC");
-  for (int i = 1; i <= symbolPinsCount; i++) {
+  for (int i = 1; i <= a_symbolPinsCount; i++) {
     bool pinAssigned = false;
-    for(int j = 0; j < tbwPinsTable->rowCount(); j++) {
+    for(int j = 0; j < a_tbwPinsTable->rowCount(); j++) {
       if (j == r) continue;
-      auto itm = tbwPinsTable->item(j,1);
+      auto itm = a_tbwPinsTable->item(j,1);
       if (itm == nullptr) continue;
       QString s = itm->text();
       if (s.isEmpty()) continue;
@@ -428,49 +432,49 @@ void SpiceLibCompDialog::slotTableCellDoubleClick()
       cbxSelectPin->addItem(QString::number(i));
     }
   }
-  tbwPinsTable->item(r,c)->setText("");
-  tbwPinsTable->setCellWidget(r,c,cbxSelectPin);
+  a_tbwPinsTable->item(r,c)->setText("");
+  a_tbwPinsTable->setCellWidget(r,c,cbxSelectPin);
   connect(cbxSelectPin,SIGNAL(activated(int)),this,SLOT(slotSelectPin()));
 
-  prev_col = c; // remebmebr cell with combo box
-  prev_row = r;
+  a_prev_col = c; // remebmebr cell with combo box
+  a_prev_row = r;
 }
 
 void SpiceLibCompDialog::slotSelectPin()
 {
   QComboBox *cbxSelectPin = qobject_cast<QComboBox*>(sender());
   QString pin = cbxSelectPin->currentText();
-  int r = tbwPinsTable->currentRow();
-  int c = tbwPinsTable->currentColumn();
+  int r = a_tbwPinsTable->currentRow();
+  int c = a_tbwPinsTable->currentColumn();
   QTableWidgetItem *itm = new QTableWidgetItem(pin);
-  tbwPinsTable->removeCellWidget(r,c);
-  tbwPinsTable->setItem(r,c,itm);
+  a_tbwPinsTable->removeCellWidget(r,c);
+  a_tbwPinsTable->setItem(r,c,itm);
 
-  prev_col = -1; // clear cell index with combo box
-  prev_row = -1;
+  a_prev_col = -1; // clear cell index with combo box
+  a_prev_row = -1;
 }
 
 void SpiceLibCompDialog::slotBtnOpenLib()
 {
   QString s = QFileDialog::getOpenFileName(this, tr("Open SPICE library"),
-                                           lastLibDir,
+                                           a_lastLibDir,
                                            tr("SPICE files (*.cir +.ckt *.sp *.lib)"));
   if (!s.isEmpty()) {
     QFileInfo inf(s);
-    lastLibDir = inf.absoluteDir().path();
-    edtLibPath->setText(s);
+    a_lastLibDir = inf.absoluteDir().path();
+    a_edtLibPath->setText(s);
   }
 }
 
 void SpiceLibCompDialog::slotBtnOpenSym()
 {
   QString s = QFileDialog::getOpenFileName(this, tr("Open symbol file"),
-                                           lastSymbolDir,
+                                           a_lastSymbolDir,
                                            tr("Schematic symbol (*.sym)"));
   if (!s.isEmpty()) {
     QFileInfo inf(s);
-    lastSymbolDir = inf.absoluteDir().path();
-    edtSymFile->setText(s);
+    a_lastSymbolDir = inf.absoluteDir().path();
+    a_edtSymFile->setText(s);
   }
 }
 
@@ -478,11 +482,11 @@ bool SpiceLibCompDialog::setCompProps()
 {
   QStringList pins;
   QString pin_string;
-  if (rbAutoSymbol->isChecked()) {
+  if (a_rbAutoSymbol->isChecked()) {
     pin_string = "";
   } else {
-    for (int i = 0; i < tbwPinsTable->rowCount(); i++) {
-      QTableWidgetItem *itm = tbwPinsTable->item(i,1);
+    for (int i = 0; i < a_tbwPinsTable->rowCount(); i++) {
+      QTableWidgetItem *itm = a_tbwPinsTable->item(i,1);
       if (itm == nullptr) continue;
     QString s = itm->text();
       if (s == "NC") {
@@ -494,15 +498,15 @@ bool SpiceLibCompDialog::setCompProps()
     pin_string = pins.join(";");
   }
 
-  if (rbUserSym->isChecked() &&
-      !QFileInfo::exists(edtSymFile->text())) {
+  if (a_rbUserSym->isChecked() &&
+      !QFileInfo::exists(a_edtSymFile->text())) {
     QMessageBox::warning(this,tr("Warning"),tr("Set a valid symbol file name"));
     return false;
   }
 
-  QString  sch_dir = Doc->getFileInfo().absoluteDir().path();
-  QString libpath = edtLibPath->text();
-  QString sympath = edtSymFile->text();
+  QString  sch_dir = a_Doc->getFileInfo().absoluteDir().path();
+  QString libpath = a_edtLibPath->text();
+  QString sympath = a_edtSymFile->text();
   if (libpath.startsWith(sch_dir)) {
     libpath = QDir(sch_dir).relativeFilePath(libpath);
   }
@@ -510,50 +514,50 @@ bool SpiceLibCompDialog::setCompProps()
     sympath = QDir(sch_dir).relativeFilePath(sympath);
   }
 
-  auto pp = comp->Props.begin();
+  auto pp = a_comp->Props.begin();
   (*pp)->Value = libpath;
-  (*pp)->display = chbShowLib->isChecked();
+  (*pp)->display = a_chbShowLib->isChecked();
   pp++;
-  (*pp)->Value = cbxSelectSubcir->currentText();
-  (*pp)->display = chbShowModel->isChecked();
+  (*pp)->Value = a_cbxSelectSubcir->currentText();
+  (*pp)->display = a_chbShowModel->isChecked();
   pp++;
-  if (rbAutoSymbol->isChecked()) {
+  if (a_rbAutoSymbol->isChecked()) {
     (*pp)->Value = "auto";
-  } else if (rbSymFromTemplate->isChecked()) {
-    (*pp)->Value = listSymPattern->currentItem()->text();
-  } else if (rbUserSym->isChecked()) {
+  } else if (a_rbSymFromTemplate->isChecked()) {
+    (*pp)->Value = a_listSymPattern->currentItem()->text();
+  } else if (a_rbUserSym->isChecked()) {
     (*pp)->Value = sympath;
   }
   pp++;
-  (*pp)->Value = edtParams->text();
-  (*pp)->display = chbShowParams->isChecked();
+  (*pp)->Value = a_edtParams->text();
+  (*pp)->display = a_chbShowParams->isChecked();
   pp++;
   (*pp)->Value = QString(pin_string);
-  Doc->recreateComponent(comp);
-  Doc->viewport()->repaint();
-  Doc->setChanged(true,true);
+  a_Doc->recreateComponent(a_comp);
+  a_Doc->viewport()->repaint();
+  a_Doc->setChanged(true,true);
   return true;
 }
 
 void SpiceLibCompDialog::slotBtnApply()
 {
-  if (isChanged) {
-    if (libError) {
+  if (a_isChanged) {
+    if (a_libError) {
       QMessageBox::critical(this,tr("Error"),
                             tr("There were library file parse error! Cannot apply changes."));
       return;
     }
     if (setCompProps()) {
-      isChanged = false;
-      btnApply->setEnabled(false);
+      a_isChanged = false;
+      a_btnApply->setEnabled(false);
     }
   }
 }
 
 void SpiceLibCompDialog::slotBtnOK()
 {
-  if (isChanged) {
-    if (libError) {
+  if (a_isChanged) {
+    if (a_libError) {
       QMessageBox::critical(this,tr("Error"),
                             tr("There were library file parse error! Cannot apply changes."));
       reject();
@@ -572,6 +576,6 @@ void SpiceLibCompDialog::slotBtnCancel()
 
 void SpiceLibCompDialog::slotChanged()
 {
-  isChanged = true;
-  btnApply->setEnabled(true);
+  a_isChanged = true;
+  a_btnApply->setEnabled(true);
 }
diff --git a/qucs/extsimkernels/spicelibcompdialog.h b/qucs/extsimkernels/spicelibcompdialog.h
index ef7cc7db9..7da4a07b3 100644
--- a/qucs/extsimkernels/spicelibcompdialog.h
+++ b/qucs/extsimkernels/spicelibcompdialog.h
@@ -16,32 +16,43 @@ class SpiceLibCompDialog : public QDialog {
   Q_OBJECT
 
 private:
-  int symbolPinsCount;
-  bool isChanged;
-  bool libError;
-
-  int prev_row, prev_col;
-
-  QString lastSymbolDir;
-  QString lastLibDir;
-
-  Component *comp;
-  Schematic *Doc;
-
-  SymbolWidget *symbol;
-  QLineEdit *edtLibPath, *edtParams, *edtSymFile;
-  QPlainTextEdit *edtSPICE;
-
-  QPushButton *btnOpenLib, *btnOK, *btnApply, *btnCancel, *btnOpenSym;
-  QTableWidget *tbwPinsTable;
-  QComboBox *cbxSelectSubcir;
-  QListWidget *listSymPattern;
-
-  QRadioButton *rbSymFromTemplate, *rbAutoSymbol, *rbUserSym;
-  QCheckBox *chbShowLib, *chbShowModel, *chbShowParams;
-
-  QMap<QString,QStringList> subcirPins;
-  QMap<QString,QString> subcirSPICE;
+  int a_symbolPinsCount;
+  bool a_isChanged;
+  bool a_libError;
+
+  int a_prev_row;
+  int a_prev_col;
+
+  QString a_lastSymbolDir;
+  QString a_lastLibDir;
+
+  Component* a_comp;
+  Schematic* a_Doc;
+
+  SymbolWidget *a_symbol;
+  QLineEdit* a_edtLibPath;
+  QLineEdit* a_edtParams;
+  QLineEdit* a_edtSymFile;
+  QPlainTextEdit* a_edtSPICE;
+
+  QPushButton* a_btnOpenLib;
+  QPushButton* a_btnOK;
+  QPushButton* a_btnApply;
+  QPushButton* a_btnCancel;
+  QPushButton* a_btnOpenSym;
+  QTableWidget* a_tbwPinsTable;
+  QComboBox* a_cbxSelectSubcir;
+  QListWidget* a_listSymPattern;
+
+  QRadioButton* a_rbSymFromTemplate;
+  QRadioButton* a_rbAutoSymbol;
+  QRadioButton* a_rbUserSym;
+  QCheckBox* a_chbShowLib;
+  QCheckBox* a_chbShowModel;
+  QCheckBox* a_chbShowParams;
+
+  QMap<QString, QStringList> a_subcirPins;
+  QMap<QString, QString> a_subcirSPICE;
 
   enum SPICEparseError { noError=0, failedOpenFile = -1, noSUBCKT = -2 };