how to reset(clean) a widget

["Fernando Correa da Concei;áo" <fernando conceicao terra com br>]

I´m trying to do something like a MDI window, but I use a window, and 
inside it I add GtkScrolledWindow, so when I need change the contents of 
window I need remove all things inside the Scrolledwindow to add new things.
How can I do this?

Thanks!