How to handle radio buttons ?

[<minux centrum cz>]

Hi there,

I'm just beginning with C/GTK+ programming and I don't know how to handle radio buttons. I have an assistant 
with some pages and one of those pages is a group of radio buttons. On the next assistant page after that 
with radio buttons I need to have content depending on radio button chosen on the page before.

According to the GTK+ tutorial, I've written this:

GtkWidget *button;

button = gtk_radio_button_new_with_label(NULL, "first choice");

gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(button), TRUE);

button = gtk_radio_button_new_with_label(gtk_radio_button_get_group(GTK_RADIO_BUTTON(button)), "second 
choice");


But in the next step, I don't know how to get an information about which choice has been chosen :-(

Could you please send me some example or clear it up ?

Thank you very much
Minux