nsTreeRange(nsTreeSelection* aSel, PRInt32 aMin, PRInt32 aMax) :mSelection(aSel), mPrev(nsnull), mNext(nsnull), mMin(aMin), mMax(aMax) {};
nsTreeRange(nsTreeSelection* aSel, PRInt32 aSingleVal) :mSelection(aSel), mPrev(nsnull), mNext(nsnull), mMin(aSingleVal), mMax(aSingleVal) {};
  nsTreeRange(nsTreeSelection* aSel, PRInt32 aMin, PRInt32 aMax)     :mSelection(aSel), mPrev(nsnull), mNext(nsnull), mMin(aMin), mMax(aMax) {};