AMSSpecialist

if Dialog.Message("Confirmar salida", "Estás Seguro(a) que deseas salir?", MB_YESNO, MB_ICONQUESTION, MB_DEFBUTTON2) == 6 then
Application.Exit();
end

function SaliEx()

resultado = Dialog.Message("NOMBRE DE TU SISTEMA", "¿Estas seguro que deseas salir de la aplicación?", MB_YESNO, MB_ICONEXCLAMATION, MB_DEFBUTTON1);

if resultado == 7 then
---La Acción que quieres que haga al cancelar
else
Application.Exit(9);
end

end

 SaliEx()

QueryAllowProjectClose ( )
Called whenever the project is 'told' to close. Using this function, you can control how the user can close the application, such as confirming with the user that they intended to close the application.

Returns:
True if the application should close, false if it should not close.

Example:
function QueryAllowProjectClose()
    result= Dialog.Message("Application Exit", "Are you sure that you want to quit?", MB_YESNO, MB_ICONEXCLAMATION, MB_DEFBUTTON1);
    --if they choose yes 
    if result == IDYES then
        --allow the app to close
        return true;
    else
        --cancel close
        return false;
    end
end