title: Not getting event arguments in IHTMLElement event handler
body: <p>I've added a callback to an IHTMLElement instance but when the IDispatch::Invoke is called for the event, there are never any arguments (i.e. the pDispParams->cArgs and pDispParams->cNamedArgs are always 0). For example, I add a callback for an onmouseup event. From what I can tell, a callback for this event is supposed to receive a MouseEvent object. Is that correct? If so, what do I need to do to ensure this happens? </p>
  
  <p>This is using the MSHTML for IE 6 sp2 (or better) on Windows XP SP2.</p>