'宣言 Protected Overrides Sub OnSelectionChanged( _ ByVal oldCollection As Infragistics.Controls.SelectedCollectionBase(Of DiagramItem), _ ByVal newCollection As Infragistics.Controls.SelectedCollectionBase(Of DiagramItem) _ )
protected override void OnSelectionChanged( Infragistics.Controls.SelectedCollectionBase<DiagramItem> oldCollection, Infragistics.Controls.SelectedCollectionBase<DiagramItem> newCollection )