hide gnome app and show again (...toolbar stays hidden)

[Philipp Heise <ph h gmx net>]

hello,

my gnome app is blocked for a certain amount of time and so the app 
isn't redrawn for that amount of time.
so i want to hide the whole app and fork a process to show that the app 
is working and the user has to wait.
but when i try to show the app again the toolbar is away. i try to do it 
the following way:

gtk_widget_hide_all(app);
gdk_window_process_all_updates();

...fork and do the blocking function, kill forked process ....

gtk_widget_show_all(app);


my main content is just a canvas-widget, which is shown again, but my 
toolbar is gone ... any ideas to make my
toolbar visible again ?

thnx phil