avoid gui being blocked

[Marcus Stojek]

Hi,
let's say I have a Dialog (using wxPython) with a button.
This button starts a function thats takes some time to
return. During this time the GUI is not responding to 
any action of the user. How can I keep the GUI alive?
I tried starting "go" in a thread, but the only way I can
check for the thread being finished is either
thread.join()
or:
while thread.isAlive():
   pass

In both cases the GUI still doesn't respond. Is there something 
like a thread-exit event I could use. And how?
This should be an all day problem, but I don't find a hint.

Thanks in advance,
Marcus

#-------------------------------------------------------------------
from wxPython.wx import *
import time

class Frame(wxFrame):
    def __init__(self,parent):
         ID_Button=wxNewId()
         wxFrame.__init__(self,parent,-1,"title")
         d=wxDialog(self,-1,"Dialog")
         wxButton(d,ID_Button,"Do it",wxDefaultPosition,
wxDefaultSize)
         EVT_BUTTON(d,ID_Button,self.go)
         d.ShowModal()

    def go(self,event):
        time.sleep(10)
        return 1

class Main(wxApp):
    def OnInit(self):
        frame=Frame(NULL)
        return 1

app = Main(0)
app.MainLoop()