if (mButton) mButton->SetDisabled(aDisable);
nsCOMPtr<nsIDOMHTMLButtonElement> button = do_QueryInterface(mHTMLElement); if (button) button->SetDisabled(aDisable);
nsXFormsSubmitElement::SetDisabled(PRBool aDisable){  if (mButton)    mButton->SetDisabled(aDisable);  return NS_OK;}