Handle all processing of mouse messages to the scroll bar.
操纵所有到滚动条的鼠标消息的处理。
If you don't use this flag, you have to do more work to relay the mouse messages to the tooltip control.
如果你不使用这个标志，你必须做更多的工作来将鼠标消息转发给工具提示控件。
Instead, it places all mouse and keyboard input from the user into a message queue, along with messages posted by the system and other applications.
代替的是，它把来自用户的鼠标与键盘输入放入到一个消息队列，连同系统与其它应用程序所发送的消息放在一起。
Each mouse action on the scroll bar generates at least two messages, one when the mouse button is pressed and another when it is released.
每一个滚动条上的鼠标动作都产生至少两个消息，一个在鼠标按键被压下时而另一个在它被释放时。
When a background window attempts to capture the mouse, the window receives messages only for mouse events that occur when the mouse pointer is within the visible portion of the window.
当后台窗口尝试捕获鼠标时，只有鼠标指针位于该窗口可见部分时，该窗口才接收所发生的鼠标事件的信息。
When a background window attempts to capture the mouse, the window receives messages only for mouse events that occur when the mouse pointer is within the visible portion of the window.
当后台窗口尝试捕获鼠标时，只有鼠标指针位于该窗口可见部分时，该窗口才接收所发生的鼠标事件的信息。
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