aChild->AddStateBits(NS_FRAME_OUT_OF_FLOW); nsFrameItems::AddChild(aChild);
if (childList == nsnull) { childList = lastChild = aChild; } else { lastChild->SetNextSibling(aChild); lastChild = aChild; }  for (nsIFrame* sib = lastChild->GetNextSibling(); sib; sib = sib->GetNextSibling()) { lastChild = sib; }
nsAbsoluteItems::AddChild(nsIFrame* aChild){  aChild->AddStateBits(NS_FRAME_OUT_OF_FLOW);  nsFrameItems::AddChild(aChild);}