gboolean vficon_press_key_cb(GtkWidget *widget, GdkEventKey *event, gpointer data);
gboolean vficon_press_cb(GtkWidget *widget, GdkEventButton *bevent, gpointer data);
gboolean vficon_release_cb(GtkWidget *widget, GdkEventButton *bevent, gpointer data);
gboolean vficon_press_key_cb(GtkWidget *widget, GdkEventKey *event, gpointer data);
gboolean vficon_press_cb(GtkWidget *widget, GdkEventButton *bevent, gpointer data);
gboolean vficon_release_cb(GtkWidget *widget, GdkEventButton *bevent, gpointer data);