diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..0a76a97
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,10 @@
+{
+  "workbench.colorCustomizations": {
+    "statusBar.background": "#eba0ac",
+    "statusBar.foreground": "#181825",
+    "statusBarItem.hoverBackground": "#e27687",
+    "statusBarItem.remoteBackground": "#eba0ac",
+    "statusBarItem.remoteForeground": "#181825"
+  },
+  "peacock.color": "#eba0ac"
+}
\ No newline at end of file
diff --git a/examples/.vscode/settings.json b/examples/.vscode/settings.json
new file mode 100644
index 0000000..caa2bb9
--- /dev/null
+++ b/examples/.vscode/settings.json
@@ -0,0 +1,28 @@
+{
+  "workbench.colorCustomizations": {
+    "statusBar.background": "#f5c2e7",
+    "statusBar.foreground": "#181825",
+    "statusBarItem.hoverBackground": "#ee96d6",
+    "statusBarItem.remoteBackground": "#f5c2e7",
+    "statusBarItem.remoteForeground": "#181825"
+  },
+  "peacock.color": "#f5c2e7",
+  "scratch-vhdl-vscode.templates": {
+    "led4_button4": {
+      "entity": {
+        "clk": ["in", "std_logic"],
+        "reset": ["in", "std_logic"],
+        "incr": ["in", "std_logic"],
+        "buttons": ["in", "std_logic_vector(3 downto 0)"],
+        "leds": ["out", "std_logic_vector(3 downto 0)"]
+      },
+      "signals": {},
+      "aliases": {},
+      "name": "led4_button4",
+      "constants": {
+        "button_tab_c": ["natural", "1"]
+      },
+      "libraries": { "ieee": {} }
+    }
+  }
+}
diff --git a/scratch-vhdl-vscode/src/webview/main.ts b/scratch-vhdl-vscode/src/webview/main.ts
index 47b71cb..9bb86db 100644
--- a/scratch-vhdl-vscode/src/webview/main.ts
+++ b/scratch-vhdl-vscode/src/webview/main.ts
@@ -23,6 +23,7 @@ import {
 provideVSCodeDesignSystem().register(vsCodeButton());
 
 async function updateEntity(data: { entity: Entity; filename: string }) {
+  const oldEntity = entity;
   entity = data.entity;
   filename = data.filename;
 
@@ -129,6 +130,95 @@ async function updateEntity(data: { entity: Entity; filename: string }) {
     ...categories,
   ];
 
+  if (oldEntity) {
+    const es = Object.keys(entity.entity);
+    const oes = Object.keys(oldEntity.entity);
+    for (const e in es) {
+      const v = ws.getVariable(es[e]);
+      if (!v) {
+        if (oes[e]) {
+          const ov = ws.getVariable(oes[e]);
+          if (ov) {
+            ws.renameVariableById(ov.getId(), es[e]);
+          } else {
+            ws.createVariable(es[e], null, null);
+          }
+        } else {
+          ws.createVariable(es[e], null, null);
+        }
+      }
+    }
+    const as = Object.keys(entity.aliases);
+    const oas = Object.keys(oldEntity.aliases);
+    for (const a in as) {
+      const v = ws.getVariable(as[a]);
+      if (!v) {
+        if (oas[a]) {
+          const ov = ws.getVariable(oas[a]);
+          if (ov) {
+            ws.renameVariableById(ov.getId(), as[a]);
+          } else {
+            ws.createVariable(as[a], null, null);
+          }
+        } else {
+          ws.createVariable(as[a], null, null);
+        }
+      }
+    }
+    const ss = Object.keys(entity.signals);
+    const oss = Object.keys(oldEntity.signals);
+    for (const s in ss) {
+      const v = ws.getVariable(ss[s]);
+      if (!v) {
+        if (oss[s]) {
+          const ov = ws.getVariable(oss[s]);
+          if (ov) {
+            ws.renameVariableById(ov.getId(), ss[s]);
+          } else {
+            ws.createVariable(ss[s], null, null);
+          }
+        } else {
+          ws.createVariable(ss[s], null, null);
+        }
+      }
+    }
+  } else {
+    const es = Object.keys(entity.entity);
+    for (const e in es) {
+      console.log(es[e]);
+      const v = ws.getVariable(es[e]);
+      console.log(v, !v);
+      if (!v) {
+        console.log(ws.createVariable(es[e], null, null));
+      }
+    }
+    const as = Object.keys(entity.aliases);
+    for (const a in as) {
+      const v = ws.getVariable(as[a]);
+      if (!v) {
+        ws.createVariable(as[a], null, null);
+      }
+    }
+    const ss = Object.keys(entity.signals);
+    for (const s in ss) {
+      const v = ws.getVariable(ss[s]);
+      if (!v) {
+        ws.createVariable(ss[s], null, null);
+      }
+    }
+  }
+  for (const v of ws.getAllVariables()) {
+    if (
+      !(
+        v.name in entity.entity ||
+        v.name in entity.aliases ||
+        v.name in entity.signals
+      )
+    ) {
+      ws.deleteVariableById(v.getId());
+    }
+  }
+
   ws.updateToolbox(tb);
 
   ws.getAllBlocks(false).forEach((b) =>
@@ -368,7 +458,9 @@ export class FieldVar extends Blockly.FieldVariable {
   static dropdownCreate(
     this: Blockly.FieldVariable
   ): Blockly.MenuOption[] {
-    return super.dropdownCreate().slice(0, -2);
+    const o = super.dropdownCreate();
+    if (o.length > 2) return o.slice(0, -2);
+    else return o;
   }
 
   protected render_(): void {
@@ -423,3 +515,5 @@ ws.addChangeListener((e) => {
 });
 
 main();
+
+setTimeout(() => updateEntity({ entity, filename }), 1000);
diff --git a/scratch_vhdl.code-workspace b/scratch_vhdl.code-workspace
index f357d81..28b83a7 100644
--- a/scratch_vhdl.code-workspace
+++ b/scratch_vhdl.code-workspace
@@ -25,17 +25,28 @@
           "buttons": ["in", "std_logic_vector(3 downto 0)"],
           "leds": ["out", "std_logic_vector(3 downto 0)"]
         },
+        "signals": {},
+        "aliases": {},
         "name": "led4_button4",
         "constants": {
           "button_tab_c": ["natural", "1"]
-        }
+        },
+        "libraries": { "ieee": {} }
       }
     },
     "markdownlint.config": {
       "MD033": false,
       "MD024": false
     },
-    "scratch-vhdl-vscode.asm_compile_path": "./design/asm_compile.cmd"
+    "scratch-vhdl-vscode.asm_compile_path": "./design/asm_compile.cmd",
+    "workbench.colorCustomizations": {
+      "statusBar.background": "#cba6f7",
+      "statusBar.foreground": "#181825",
+      "statusBarItem.hoverBackground": "#b077f3",
+      "statusBarItem.remoteBackground": "#cba6f7",
+      "statusBarItem.remoteForeground": "#181825"
+    },
+    "peacock.color": "#cba6f7"
   },
   "extensions": {
     "recommendations": [