<para>Event data is passed via the <seecref="T:GLib.ActionEnabledChangedArgs"/> parameter.</para>
<para>To attach a <seecref="T:GLib.ActionEnabledChangedHandler"/> to an event, add the ActionEnabledChangedHandler instance to the event. The methods referenced by the ActionEnabledChangedHandler instance are invoked whenever the event is raised, until the ActionEnabledChangedHandler is removed from the event.</para>