MenuHelpAbout(*)
{
    About := Gui("+owner" MyGui.Hwnd)  ; Make the main window the owner of the "about box".
    MyGui.Opt("+Disabled")  ; Disable main window.
    About.Add("Text",, "Text for about box.")
    About.Add("Button", "Default", "OK").OnEvent("Click", About_Close)
    About.OnEvent("Close", About_Close)
    About.OnEvent("Escape", About_Close)
    About.Show()

    About_Close(*)
    {
        MyGui.Opt("-Disabled")  ; Re-enable the main window (must be done prior to the next step).
        About.Destroy()  ; Destroy the about box.
    }
}