gdk_window_process_updates() blocks?

[Felix Kater <f kater2 gmx net>]

Hi,

gdk_window_process_update() freezes my application (gtk-2.4.13/win32) in
case that it is performed on a gdk-window of a button which is created
in a gtk-main-window which was never shown.

In case that I show the window (and hide it) before
gdk_window_process_update() there is no problem.

Is that a normal behaviour?
If so, how can I find out if a button is in a window which was never
shown?

Felix