State changing of Toggle Buttons

[Michal Porzuczek <mporzuczek gmail com>]

Hi,

I was wondering if it is possible to set a Toggle Button's state to
something else when you are inside another Toogle Button's callback. I
know there is the gtk_toggle_button_set_active method but that
requires you to have the GtkToggleButton. Is there another method that
only uses the Widget to change its state? Or is there an easy way of
accessing the GtkToggleButton from the Widget?

Thanks in advance

Michal