摘要：
public void HitTest ( int X, int Y, ref esriTOCControlItem ItemType, ref IBasicMap BasicMap, ref ILayer Layer, ref object Unk, ref object Data );各参数的含义如下：X,Y ：鼠标点击的坐标；ITemType: esriTOCControlItem枚举常量BasicMap：绑定MapControl的IBasicMap接口Layer：被点击的图层Unk：TOCControl的LegendGroup对象Data：LegendClass在LegendGroup 阅读全文
