如何使用Cmd+C停止关闭wxPython对话框

import wx

class MyDialog(wx.Dialog):
    def __init__(self, parent, title):
        super(MyDialog, self).__init__(parent, title=title)
        self.InitUI()

    def InitUI(self):
        # 在对话框中添加需要的控件
        # ...

    def OnClose(self, event):
        self.Close()

class MyFrame(wx.Frame):
    def __init__(self, parent, title):
        super(MyFrame, self).__init__(parent, title=title)
        self.InitUI()

    def InitUI(self):
        panel = wx.Panel(self)
        btn = wx.Button(panel, label='关闭对话框')
        btn.Bind(wx.EVT_BUTTON, self.OnCloseDialog)

    def OnCloseDialog(self, event):
        dlg = MyDialog(self, "对话框标题")
        dlg.ShowModal()
        dlg.Destroy()

if __name__ == '__main__':
    app = wx.App()
    frame = MyFrame(None, title='wxPython应用')
    frame.Show()
    app.MainLoop()