if os.path.exists("tips.txt"):
             wx.CallAfter(self.ShowTip, wx.GetApp().GetTopWindow(), wx.CreateFileTipProvider("tips.txt", 0))
 
         if os.path.exists("tips.txt"):
             wx.CallAfter(self.ShowTip, wx.GetApp().GetTopWindow(), wx.CreateFileTipProvider("tips.txt", 0))