diff --git a/src/gtk/collpane.cpp b/src/gtk/collpane.cpp
index 9dab861247..e616adb537 100644
--- a/src/gtk/collpane.cpp
+++ b/src/gtk/collpane.cpp
@@ -93,6 +93,10 @@ static void gtk_collapsiblepane_expanded_callback (GObject    *object,
 
     if (p->HasFlag(wxCP_NO_TLW_RESIZE))
     {
+        // fire an event
+        wxCollapsiblePaneEvent ev(p, p->GetId(), p->IsCollapsed());
+        p->GetEventHandler()->ProcessEvent(ev);
+    
         // the user asked to explicitely handle the resizing itself...
         return;
     }