但是你怎么知道当前是哪个元素在处理点击事件？
Please note that these properties don't always work on a click event.
对于用户交互来说，你可以处理键盘敲击或按钮点击或其他控件事件。
For interaction with the user, you can process keystrokes or clicks on buttons or other components.
在属性窗体创建事件处理代码的方法是点击事件标签。
You can create an event handler by using the Events TAB of the Properties window.
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