toggle = 0
;-Caption
LWIN & '::
if(toggle == 0)
{
WinSet, Style, -0xC00000, A
toggle = 1
;
}
else
{
;+Caption
WinSet, Style, +0xC00000, A
toggle = 0
;

!p::
    ToggleMenu( WinExist("A") )
return

ToggleMenu(hWin) {
    static WinList := {}

    if WinList[hWin] {
        DllCall("SetMenu", "Ptr", hWin, "Ptr", WinList[hWin])
        WinList[hWin] := 0
        return -1
    }

    if WinList[hWin] := DllCall("GetMenu", "Ptr", hWin)
        return DllCall("SetMenu", "Ptr", hWin, "Ptr", 0)
}
}