BringWindowToTop(Handle)
SetWindowPos函数，指定窗口的 最顶风格,用WS_EX_TOPMOST扩展窗口的风格
Example:
void ToggleTopMost(
CWnd *pWnd)
{
ASSERT_VALID(pWnd)
pWnd ->SetWindowPos(pWnd-> GetStyle( ) &WS_EX_TOPMOST)?
&wndNoTopMOST: &wndTopMost,0,0,0,0,SSP_NOSIZE|WSP_NOMOVE)
}
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