使一个子窗体总在最上

可采用Windows的API函数进行解决

在想要放在最上层的窗体顶部放置以下代码：
Private   Declare   Function   SetWindowPos&   Lib   "user32"   (ByVal   hwnd   As   Long,   ByVal   hWndInsertAfter   As   Long,   ByVal   X   As   Long,   ByVal   Y   As   Long,   ByVal   cx   As   Long,   ByVal   cy   As   Long,   ByVal   wFlags   As   Long) 

在form_load中放置：
SetWindowPos   Me.hwnd,   -1,   0,   0,   0,   0,   3