WM_CF_STAYONTOP

WM_CF_STAYONTOP：

Make sure window stays on top of all siblings created without this flag.

译:
确保当前新建的子窗口总是位于所有链表中所记录的其它同级别子窗口(这些子窗口没有WM_CF_STAYONTOP标志)的最前面。

语境：
uCGUI项目