Add another level to the window hierarchy, so that the scrollbars and the area they scroll are in a child window positioned below the toolbar.
添加另一个层面的窗口层次结构，使滚动条和地区他们滚动在一个子窗口下方的工具栏。
Add another level to the window hierarchy, so that the scrollbars and the area they scroll are in a child window positioned below the toolbar.
添加另一个层面的窗口层次结构，使滚动条和地区他们滚动在一个子窗口下方的工具栏。
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