Check event handler

def OnFont(self, event):
        """Check event handler"""

        font_data = wx.FontData()

        # Disable color chooser on Windows
        font_data.EnableEffects(False)

        if self.chosen_font:
            font_data.SetInitialFont(self.chosen_font)

        dlg = wx.FontDialog(self, font_data)

        if dlg.ShowModal() == wx.ID_OK:
            font_data = dlg.GetFontData()

            font = self.chosen_font = font_data.GetChosenFont()

            self.font_face = font.GetFaceName()
            self.font_size = font.GetPointSize()
            self.font_style = font.GetStyle()
            self.font_weight = font.GetWeight()

        dlg.Destroy()

        post_command_event(self, self.DrawChartMsg)