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