diff --git a/lib/src/ast/variable_expression.rs b/lib/src/ast/variable_expression.rs
index a61a498..6cfeb24 100644
--- a/lib/src/ast/variable_expression.rs
+++ b/lib/src/ast/variable_expression.rs
@@ -19,14 +19,23 @@ impl VariableExpression {
         }
     }
 
+    #[inline]
     pub fn name(&self) -> &StString {
         &self.name
     }
 
+    /// Origin name of the variable
+    #[inline]
+    pub fn org_name(&self) -> &String {
+        self.name().origin_string()
+    }
+
+    #[inline]
     pub fn ty(&self) -> Option<Rc<Box<dyn Type>>> {
         self.ty.clone()
     }
 
+    #[inline]
     pub fn set_ty(&mut self, ty: Option<Rc<Box<dyn Type>>>) {
         self.ty = ty
     }
diff --git a/lib/src/utils/stringify.rs b/lib/src/utils/stringify.rs
index f53e3d3..8a34f58 100644
--- a/lib/src/utils/stringify.rs
+++ b/lib/src/utils/stringify.rs
@@ -85,7 +85,7 @@ impl<W: Write> AstVisitor<'_> for StringifyVisitor<W> {
     }
 
     fn visit_variable_expression(&mut self, variable: &'_ VariableExpression) {
-        self.write(format_args!("{}", variable.name().origin_string()));
+        self.write(format_args!("{}", variable.org_name()));
     }
 
     fn visit_call_expression(&mut self, call: &'_ CallExpression) {
diff --git a/viewer/src/main.rs b/viewer/src/main.rs
index a8c0523..c4b49f4 100644
--- a/viewer/src/main.rs
+++ b/viewer/src/main.rs
@@ -2,6 +2,7 @@ mod column_object;
 mod stc_viewer;
 
 use crate::stc_viewer::{StcViewerApp, STC_VIEWER_COLUMN_NAME};
+use glib::{ControlFlow, MainContext};
 use gtk::prelude::*;
 use gtk::{
     Adjustment, Application, ApplicationWindow, CellRendererText, Orientation, Paned,
@@ -12,6 +13,11 @@ use stc::prelude::*;
 use std::rc::Rc;
 use std::sync::Mutex;
 
+/// Send UI operations from other threads
+enum UIMessages {
+    Refresh,
+}
+
 fn main() {
     pretty_env_logger::init();
 
@@ -138,6 +144,27 @@ fn build_ui(app: &Application, mgr: UnitsManager) {
         }
     });
 
+    let (tx, rx) = MainContext::channel::<UIMessages>(glib::Priority::DEFAULT);
+
+    // refresh UI when the window is shown
+    window.connect_show(move |_| {
+        let tx = tx.clone();
+        glib::idle_add(move || {
+            tx.send(UIMessages::Refresh).unwrap();
+            ControlFlow::Break
+        });
+    });
+
+    // handle UI messages from other threads
+    let app_copy = stc_app.clone();
+    rx.attach(None, move |msg| {
+        match msg {
+            UIMessages::Refresh => app_copy.lock().unwrap().refresh(),
+        };
+
+        ControlFlow::Continue
+    });
+
     window.add(&paned);
     window.show_all();
 }