expose events

[Jim Crafton <jim crafton verizon net>]

when you have an expose event callback are you supposed to return TRUE 
or FALSE?
If I understand the docs on events, if I return FALSE then no more event 
handlers/callbacks get processed, if I return TRUE then the event gets 
passed to the next callback.
But I notice that if I have a GtkWindow, then add a GtkButton to it, if 
I return FALSE from the expose callback that I connected to the windows 
expose signal, I see the effect of the various drawing calls in my 
expose callback, but I do NOT see the button widget !
However if I return TRUE from my expose callback, I do see the button, 
but none of my drawing code appears!
Any ideas  - obviously I am doing something wrong, but I don't know what!

Thanks

Jim