How to access to a check button label

["Germano Rizzo" <manomano ciaoweb it>]

Hi!
    I'm using a gtk_check_button... the API dox say that if I use
gtk_check_button_new_with_label("*"), it creates a label next to the button.
Well, that's true; but how can I change its text? I tried with
gtk_label_set_text(GTK_CHECK_BUTTON(mywid)->label),
gtk_label_set_text(GTK_LABEL(mywid)), and all I can think about, but...
alas! No luck! :(
    Thanx in advance,
        mano :)