Select and copy text from dialog in wxPython

Question

I have a wxPython app, and in this app, I can select and copy text from various frames, but I can't do so from dialogs. Is there a way to do this?

I understand I could probably do this by putting some kind of TextCtrl in the dialog, but I'd like to be able to do this from a standard looking dialog.

EDIT:

Sorry, I should have been more specific. I can't select text from a wx.MessageBox under Windows Vista or Mac (don't have access to Linux to try that). Here is one example of the call to create the message box:

wx.MessageBox(str(msg), "Could not load ballots", wx.OK|wx.ICON_ERROR)

I am unable to select the text of the message box.