VB顶级菜单和右键菜单自绘的混合效果,
Private Type DRAWITEMSTRUCT
CtlType As Long ‘控件类型
CtlID As Long ‘控件id
itemID As Long ‘菜单项、列表框或组合框中某一项的索引值
itemAction As Long ‘控件行为
itemState As Long ‘控件状态
hwndItem As Long ‘父窗口句柄或菜单句柄
hdc As Long ‘控件对应的绘图设备句柄
rcItem As RECT ‘控件所占据的矩形区域
ItemData As Long ‘列表框或组合框中某一项的值
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