mChildIndex = 0;
mChildIndex = 1;
nsMsgThreadEnumerator::nsMsgThreadEnumerator(nsMsgThread *thread, nsMsgKey startKey,                                     nsMsgThreadEnumeratorFilter filter, void* closure)    : mRowCursor(nsnull), mResultHdr(nsnull), mDone(PR_FALSE),      mFilter(filter), mClosure(closure){    NS_INIT_REFCNT();	mCurKey = startKey;	mChildIndex = 0;	mThread = thread;    NS_ADDREF(thread);}