make the toolbar inherit from the dataModelWidget class like the trees.

widget/src/xpwidgets/nsToolbar.cpp

@@ -88,7 +88,7 @@ static CNavTokenDeallocator gItemInfoKiller;*/
 //--------------------------------------------------------------------
 //-- nsToolbar Constructor
 //--------------------------------------------------------------------
-nsToolbar::nsToolbar() : ChildWindow(), nsIToolbar()
+nsToolbar::nsToolbar() : nsDataModelWidget(), nsIToolbar()
 {
   NS_INIT_REFCNT();
 
@@ -820,6 +820,14 @@ nsEventStatus nsToolbar::HandleEvent(nsGUIEvent *aEvent)
   
 }
 
+
+//-------------------------------------------------------------------
+void nsToolbar::HandleDataModelEvent(int anEvent, nsHierarchicalDataItem* pItem)
+{
+	Invalidate(PR_FALSE);
+}
+
+
 //-------------------------------------------------------------------
 NS_METHOD nsToolbar::SetWrapping(PRBool aDoWrap)
 {

widget/src/xpwidgets/nsToolbar.h

@@ -23,11 +23,13 @@
 #include "nsWindow.h"
 #include "nsIImageButton.h"
 #include "nsIToolbarItem.h"
+#include "nsDataModelWidget.h"
+
 
 class ToolbarLayoutInfo;
 
 //------------------------------------------------------------
-class nsToolbar : public ChildWindow,
+class nsToolbar : public nsDataModelWidget,
                   public nsIToolbar,
                   public nsIToolbarItem
                   
@@ -62,7 +64,7 @@ public:
     NS_IMETHOD_(nsEventStatus) HandleEvent(nsGUIEvent *aEvent);
     NS_IMETHOD_(nsEventStatus) OnPaint(nsIRenderingContext& aRenderingContext,
                                        const nsRect& aDirtyRect);
-
+	NS_IMETHOD_(void) HandleDataModelEvent(int event, nsHierarchicalDataItem* pItem) ;
 
     // nsIToolbarItem
     NS_IMETHOD Repaint(PRBool aIsSynchronous);