Close secondary windows

["Rafael Morales" <rafaelmp gmail com>]

Hi list,

I'm developing a program that opens a main window, but this main window
needs to open new windows. So,  my problem is how can I close
these windows without close the main window ???. 
If I use Gtk2->main_quit, will close all windows even the main
window, and I just need to close the secondary window and keep the main
window running.

Regards and  thanks to all !!!