bug 107900, r=jag, sr=ben, add toolbarbutton and button to lazy elements

that don't have their contents built right away

content/xul/templates/src/nsXULContentBuilder.cpp

@@ -1406,7 +1406,9 @@ nsXULContentBuilder::IsOpen(nsIContent* aElement)
     // Treat the 'root' element as always open, -unless- it's a
     // menu/menupopup. We don't need to "fake" these as being open.
     if ((aElement == mRoot) && (tag.get() != nsXULAtoms::menu) &&
-        (tag.get() != nsXULAtoms::menubutton))
+        (tag.get() != nsXULAtoms::menubutton) &&
+        (tag.get() != nsXULAtoms::toolbarbutton) &&
+        (tag.get() != nsXULAtoms::button))
       return PR_TRUE;
 
     nsAutoString value;
@@ -1511,7 +1513,8 @@ nsXULContentBuilder::IsLazyWidgetItem(nsIContent* aElement)
 
     if ((tag.get() == nsXULAtoms::tree) || (tag.get() == nsXULAtoms::treeitem) ||
         (tag.get() == nsXULAtoms::menu) || (tag.get() == nsXULAtoms::menulist) ||
-        (tag.get() == nsXULAtoms::menubutton))
+        (tag.get() == nsXULAtoms::menubutton) || (tag.get() == nsXULAtoms::toolbarbutton) ||
+        (tag.get() == nsXULAtoms::button))
         return PR_TRUE;
 
     return PR_FALSE;