1. 我们需要申明以下几个API函数:

Function long SetWindowLongA(ulong hWnd, int nIndex, long dwNewLong) library "user32"
Function long GetWindowLongA(ulong hWnd, int nIndex) library "user32"

2. 建立一个Response类型的窗口, 记住: ControlMenu属性必须为False.

3. 在窗口的Open事件里:

constant long GWL_STYLE = -16

constant long WS_SYSMENU          = 524288
constant long WS_THICKFRAME       = 262144

long dwStyle
dwStyle = GetWindowLongA(Handle(this), GWL_STYLE)

SetWindowLongA(Handle(this), GWL_STYLE, dwStyle + WS_THICKFRAME + WS_SYSMENU)