Index: /trunk/src/VBox/Frontends/VirtualBox/src/selector/UIToolsToolbar.cpp
===================================================================
--- /trunk/src/VBox/Frontends/VirtualBox/src/selector/UIToolsToolbar.cpp	(revision 68170)
+++ /trunk/src/VBox/Frontends/VirtualBox/src/selector/UIToolsToolbar.cpp	(revision 68171)
@@ -100,5 +100,6 @@
     /* Acquire the sender: */
     QIToolButton *pButton = sender() ? qobject_cast<QIToolButton*>(sender()) : 0;
-    AssertPtrReturnVoid(pButton);
+    if (!pButton)
+        pButton = m_mapButtons.value(m_mapButtons.keys().first());
 
     /* Handle known buttons: */
@@ -123,4 +124,7 @@
     /* Prepare connections: */
     prepareConnections();
+
+    /* Initialize: */
+    sltHandleButtonToggle();
 }