What's wrong with component refresh?

[wslu <wslu sina com>]

I'm coding a GUI application using gtk+.
I create a thread using pthread_create before the main
window show, this thread communicate with window using
signals and System V message queue.
The problem is:
After a successful communication between thread and the window,
and when the window need to be redrawed(e.g., when resize it),
it seams that the window "forget" to refresh his child components. 
This make all of the components disappear.
what's wrong is it?
Is it the correct way to use thread with GTK+?
thanx for your any reply...