'宣言 Protected Overrides Sub OnSelectionChanged( _ ByVal oldCollection As PivotSelectedCollectionBase(Of PivotCell), _ ByVal newCollection As PivotSelectedCollectionBase(Of PivotCell) _ )
protected override void OnSelectionChanged( PivotSelectedCollectionBase<PivotCell> oldCollection, PivotSelectedCollectionBase<PivotCell> newCollection )