<para>The <seecref="M:Gtk.Widget.StateFlagsChanged"/> event utilizes this delegate:</para>
<para>Event data is passed via the <seecref="T:Gtk.StateFlagsChangedArgs"/> parameter.</para>
<para>To attach a <seecref="T:Gtk.StateFlagsChangedHandler"/> to an event, add the StateFlagsChangedHandler instance to the event. The methods referenced by the StateFlagsChangedHandler instance are invoked whenever the event is raised, until the StateFlagsChangedHandler is removed from the event.</para>