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