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