def Display(self,event=None):

        self.canvas.Show(False)
        dlg = FileDialog(self, "Choose Display Module",default_dir=os.getcwd()+"/",
                        wildcard='Python Plot Files|plot*.py|All Files|*.*')
        result = dlg.ShowModal()
        dlg.Destroy()

        if result == 'ok':
            lfname = dlg.GetPaths()[0]
            modulename=os.path.splitext(os.path.split(lfname)[-1])[0]

            self.params['display_module']=modulename