'宣言
Public Class _ItemizedOverlayLegendItem Inherits _ItemizedLegendItemDataModel Implements IColorLegendItem, IItemizedLegendItemDataModel, IQueryInterface, IStyleLegendItem
public class _ItemizedOverlayLegendItem : _ItemizedLegendItemDataModel, IColorLegendItem, IItemizedLegendItemDataModel, IQueryInterface, IStyleLegendItem