title: Request.Form[MyControl.ClientID] is Null
body: <p>I've noticed that, during a postback, <code>Request.Form[MyControl.ClientID]</code> is <code>null</code>. However, <code>Request.Form[MyControl.Name]</code> contains the expected value.</p>
  
  <p>This is unexpected. Is this documented somewhere?</p>