def Configure(self, expr=""):
        panel = eg.ConfigPanel(resizable=True)
        textControl = wx.TextCtrl(panel, -1, expr, size = (300,-1), style = wx.TE_MULTILINE )
        panel.sizer.Add(wx.StaticText(panel,-1,self.text.python_expr), 0,wx.LEFT|wx.TOP, 10)
        panel.sizer.Add(textControl, 1, wx.LEFT|wx.RIGHT|wx.BOTTOM|wx.EXPAND, 10)