item, flags = self.tree.HitTest(pt)
         if item == self.tree.GetSelection():
             self.SetOverview(self.tree.GetItemText(item), self.curOverview)
         item, flags = self.tree.HitTest(pt)
         if item == self.tree.GetSelection():
             self.SetOverview(self.tree.GetItemText(item), self.curOverview)