//Case 1: when i click back button on my pad

        private void HandleInputEvents(ButtonEventArgs args)
        {
            //For testing purposes..only PlayerIndex One is valid
            if (args.PlayerIndex != 0)
                return;

            if (args.EventType == KeyButtonState.Clicked)
            {
                //Back
                if (args.ButtonsList.Contains(32))
                    Root.Instance.QueueEndRendering();
[...]

//Case 2: the window was closed..this code is from my WindowEventListener

        #region WindowClosed
        /// <summary>
        /// Window has closed
        /// </summary>
        /// <param name="rw">The RenderWindow which created this event</param>
        public void WindowClosed(RenderWindow rw)
        {
            Contract.RequiresNotNull(rw, "RenderWindow");

            // Only do this for the Main Window
            if (rw == EngineCore.Instance.RenderWindow)
                Root.Instance.QueueEndRendering();
        }
        #endregion

//Case 3: When i send the quit command from the console:

        #region Quit
        /// <summary>
        ///
        /// </summary>
        internal static int Quit(params string[] args)
        {
            Root.Instance.QueueEndRendering();
            return 0;
        }
        #endregion Quit

//and that's all