diff --git a/src/gtk/combobox.cpp b/src/gtk/combobox.cpp
index 97cbfb477a..d719f40bc9 100644
--- a/src/gtk/combobox.cpp
+++ b/src/gtk/combobox.cpp
@@ -629,7 +629,24 @@ void wxComboBox::OnChar( wxKeyEvent &event )
         event.SetString( GetValue() );
         event.SetInt( GetSelection() );
         event.SetEventObject( this );
-        GetEventHandler()->ProcessEvent( event );
+        
+        if (!GetEventHandler()->ProcessEvent( event ))
+        {
+            // This will invoke the dialog default action, such
+            // as the clicking the default button.
+
+            wxWindow *top_frame = m_parent;
+            while (top_frame->GetParent() && !(top_frame->IsTopLevel()))
+                top_frame = top_frame->GetParent();
+
+            if (top_frame && GTK_IS_WINDOW(top_frame->m_widget))
+            {
+                GtkWindow *window = GTK_WINDOW(top_frame->m_widget);
+
+                if (window->default_widget)
+                    gtk_widget_activate (window->default_widget);
+            }
+        }
             
         // Catch GTK event so that GTK doesn't open the drop
         // down list upon RETURN.
diff --git a/src/gtk1/combobox.cpp b/src/gtk1/combobox.cpp
index 97cbfb477a..d719f40bc9 100644
--- a/src/gtk1/combobox.cpp
+++ b/src/gtk1/combobox.cpp
@@ -629,7 +629,24 @@ void wxComboBox::OnChar( wxKeyEvent &event )
         event.SetString( GetValue() );
         event.SetInt( GetSelection() );
         event.SetEventObject( this );
-        GetEventHandler()->ProcessEvent( event );
+        
+        if (!GetEventHandler()->ProcessEvent( event ))
+        {
+            // This will invoke the dialog default action, such
+            // as the clicking the default button.
+
+            wxWindow *top_frame = m_parent;
+            while (top_frame->GetParent() && !(top_frame->IsTopLevel()))
+                top_frame = top_frame->GetParent();
+
+            if (top_frame && GTK_IS_WINDOW(top_frame->m_widget))
+            {
+                GtkWindow *window = GTK_WINDOW(top_frame->m_widget);
+
+                if (window->default_widget)
+                    gtk_widget_activate (window->default_widget);
+            }
+        }
             
         // Catch GTK event so that GTK doesn't open the drop
         // down list upon RETURN.