NS_IMETHODIMP nsView::SetNextSibling(nsIView* aView) { mNextSibling = aView; return NS_OK; }
void SetNextSibling(nsView *aSibling) { mNextSibling = aSibling; }
NS_IMETHODIMP nsView::SetNextSibling(nsIView* aView){  mNextSibling = aView;  return NS_OK;}