WinOnWin  GuiName LeftOffset TopOffset

This command instructs the window to disregard the Left and Top 
offsets given in the WinBig command and instead open relative to
a "GuiName's" window.

GuiName    : The name of the Gui File whose window will be used
LeftOffset : Left Offset from the GuiName window position
TopOffset  : Top Offset from GuiName window position