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我们在对话类中调用ON_WM_CONTEXTMENU()inside BEGIN_MESSAGE_MAP。但是，对于组合框控件，右键单击右侧的下拉箭头会触发上下文菜单。但是对于控件的其余部分，用户必须双击右键才能使其正常工作。
ON_WM_CONTEXTMENU()
BEGIN_MESSAGE_MAP
可能是什么原因？小向下箭头有什么特别之处吗？
