return NS_ERROR_NOT_IMPLEMENTED;
if (mObservers) { PRUint32 count; mObservers->Count(&count); for (PRUint32 i = 0; i < count; ++i) { nsCOMPtr<nsIXULOutlinerBuilderObserver> observer; mObservers->QueryElementAt(i, NS_GET_IID(nsIXULOutlinerBuilderObserver), getter_AddRefs(observer)); if (observer) { PRBool canDropOn = PR_FALSE; observer->CanDropOn(row, &canDropOn); if (canDropOn) observer->OnDrop(row, orient); } } }  return NS_OK;
nsXULOutlinerBuilder::Drop(PRInt32 row, PRInt32 orient){    return NS_ERROR_NOT_IMPLEMENTED;}