如果你想自定义滚动条控件，那么你必须制定自己的方法。
If you want to customize a scrollbar control, then you must devise your own method.
因此，我们需要做的就是建立我们作为一个用户控件的滚动条。
So what we have to do is create our own scrollbar as a user control.
多数需要滚动条的控件本身提供滚动条，而不需要该控件。
Most controls that need scroll bars already provide them and do not require this control.
多数需要滚动条的控件本身提供滚动条，而不需要该控件。
Most controls that need scroll bars already provide them and do not require this control.
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