Gtk Radio menu

My program named strip experiment has to work select polygon or vertex.
I try to call this work, when user push a menu item.

I use radio menu item provided by gtk+.

This item can catch only group change signal.
I wonder to catch a time for user to push radio item, But I now understand it.


It is to catch toggled signal about GtkCheckMenuItem.
GtkCheckMenuItem is super class for GtkRadioMenuItem.

When user push radio menu item, this signal is called.