The connect-proxy signal is emitted after connecting a proxy to an action in the group. This is intended for simple customizations for which a custom action class would be too clumsy, e.g. showing tooltips for menuitems in the statusbar. Three items, the GtkUIManager instance, the action and the proxy widget are passed to a registered callback.

Callback function

void callback(GtkUIManager uimanager, GtkAction UNKNOWN, GtkWidget UNKNOWN);