Set focus

["Johnny" <johnny troppoilmigliore inwind it>]

Hi, I'm using an application with gtk1.2.
How can I set the focus to a widget?
I've another question, in my interface I've used a GtkSheet, I can't use
TAB,PAGE UP or PAGE DOWN button because they are already used by the GtkSheet,
how can I use them?

Thanks for help
Excuse me for very bad english
Johnny