//-----------------------------------------------------------------------------
 
 extern "C" {
-static void gtk_checkbox_toggled_callback(GtkWidget *widget, wxCheckBox *cb)
+static void gtk_checkbox_toggled_callback(GtkWidget *WXUNUSED(widget),
+                                          wxCheckBox *cb)
 {
     if (g_isIdle) wxapp_install_idle_handler();
 
     wxCommandEvent event(wxEVT_COMMAND_CHECKBOX_CLICKED, cb->GetId());
     event.SetInt(cb->GetValue());
     event.SetEventObject(cb);
-    cb->GetEventHandler()->ProcessEvent(event);
+    cb->HandleWindowEvent(event);
 }
 }