<ThreadSafetyStatement>Gtk# is thread aware, but not thread safe; See the <linklocation="node:gtk-sharp/programming/threads">Gtk# Thread Programming</link> for details.</ThreadSafetyStatement>
<para>The <seecref="M:Atk.Object.StateChange"/> event utilizes this delegate:</para>
<para>Event data is passed via the <seecref="T:Atk.StateChangeArgs"/> parameter.</para>
<para>To attach a <seecref="T:Atk.StateChangeHandler"/> to an event, add the StateChangeHandler instance to the event. The methods referenced by the StateChangeHandler instance are invoked whenever the event is raised, until the StateChangeHandler is removed from the event.</para>