hack to make virtual and grouping objectlistview in Mac OS X

gistfile1.py

def RefreshObjects(self, aList=None):
        """
        Refresh all the objects in the given list
        """
        self.lastGetObjectIndex = -1
        # If no list is given, refresh everything
        if aList:
            for x in aList:
                idx = self.GetIndexOf(x)
                if idx != -1:
                    self.RefreshItem(idx)
        else:
            if self.GetItemCount() == 0:
                pass
            else:
                self.RefreshItems(0, self.GetItemCount() - 1)