所有的overlapped窗口和popup窗口，都有WS_CLIPSIBLINGS 属性，
这些窗口不能在它的sibling窗口上绘图
对于child窗口，如果没有这个属性，它能在它的sibling窗口上绘图
+-----------+
|A |
| +--------+-------
| | | B |
| | C | |
+---+-------+ |
| |
+---------------+
如果A, B都是child窗口，
如果A具有WS_CLIPSIBLINGS属性，
那么A重绘时不会重绘C部分
clip是裁减，去除的意思 相当与英文的Exclude
WS_OVERLAPPED Creates an overlapped window. An overlapped window usually has a caption and a border
WS_POPUP Creates a pop-up window. Cannot be used with the WS_CHILD style.
WS_CHILD Creates a child window. Cannot be used with the WS_POPUP style.
WS_CLIPSIBLINGS Clips child windows relative to each other; that is, when a particular child window receives a paint message, the WS_CLIPSIBLINGS style clips all other overlapped child windows out of the region of the child window to be updated. (If WS_CLIPSIBLINGS is not given and child windows overlap, when you draw within the client area of a child window, it is possible to draw within the client area of a neighboring child window.) For use with the WS_CHILD style only
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