call connected signal

[Andreas Volz <lists brachttal net>]

Hi,

how could I force gtkmm to call a signal. I need this for redraw of a
GUI part. I connected it this way:

    target_combo.signal_changed().connect (sigc::mem_fun (*this,
                                           &Application::on_target_combo_changed));

If I call the on_target_combo_changed() function there're several
warnings and the app crash. I think there's a libsig call for this. But
I couldn't find it.

regards
Andreas