how to change the gnomeapp contents

[Derethor <derethor poves com>]

 I am writting an application where I need to change the main GnomeApp
contents.

 I was debuggin all my code, and I discovered that
gnome_app_set_contents modify my previus widget (so, I cant call
gtk_widget_destroy later) and If I free my gtkwidget before I change the
gnome contents... the app crashes (it is normal)

 so, are there any reasons for gnome_app_set_contents to modify my
previus contents?

 thanks a lot

-- 
signed
          derethor of centolos