form_control_frame->QueryInterface(NS_GET_IID(nsISelectControlFrame), (void **)&select_frame);
CallQueryInterface(form_control_frame, &select_frame);
nsHTMLSelectElement::GetSelectFrame(){  nsIFormControlFrame* form_control_frame = GetFormControlFrame(PR_FALSE);  nsISelectControlFrame *select_frame = nsnull;  if (form_control_frame) {    form_control_frame->QueryInterface(NS_GET_IID(nsISelectControlFrame),                                       (void **)&select_frame);  }  return select_frame;}