[Twisted-Python] wxreactor and dialog on win xp problem

I have a problem with wxreactor on win xp. I insert a ShowModal() of a TextEntryDialog after an event of a button in a frame. The ShowModal function of the dialog, don't return me the control after the dialog has close, but only when the global application has closed. I try this with a bit of print. Show the example for tests. On my linux-box, with the same wxpython and twisted version, all work well. python 2.3.4 wx 2.5.3.1 twisted 1.3.0 Thanks, Michele