public void RecalulateWindowSize()
        {
            uiOffset = new Vector3();
            var v1 = (float)GraphicsDevice.PresentationParameters.BackBufferWidth / (float)GraphicsDevice.PresentationParameters.BackBufferHeight;
            var v2 = 16f / 9f;
            if (Math.Round(v1, 1) != Math.Round(v2, 1))
            {
                if (v1 > Math.Round(v2, 1))
                {
                    var newWidth = GraphicsDevice.PresentationParameters.BackBufferHeight / 9 * 16;
                    var unusedWidth = GraphicsDevice.PresentationParameters.BackBufferWidth - newWidth;
                    uiOffset.X = unusedWidth / 2;
                    uiOffset.Z = (float)GraphicsDevice.PresentationParameters.BackBufferHeight / 1080f;
                }
                else
                {
                    var newHeight = GraphicsDevice.PresentationParameters.BackBufferWidth / 16 * 9;
                    var unusedHeight = GraphicsDevice.PresentationParameters.BackBufferHeight - newHeight;
                    uiOffset.Y = unusedHeight / 2;
                    uiOffset.Z = (float)GraphicsDevice.PresentationParameters.BackBufferWidth / 1920f;
                }
            }
            else
            {
                uiOffset.Z = (float)GraphicsDevice.PresentationParameters.BackBufferWidth / 1920f;
            }
        }