title: Is it necessary to call base.OnAttached() in a WPF/Silverlight behavior?
body: <p>When deriving from <code>Behavior&lt;T&gt;</code>, most code samples explicitly call <code>base.OnAttached()</code> (and <code>base.OnDetaching()</code>) in the overridden methods. Is this necessary, or just 'good practice'? </p>