Brush.Refresh C# (CSharp) Method

    public abstract void Refresh();

        private void Overlay_MouseWheel(object sender, MouseWheelEventArgs e)
        {
            if (WintabUtility.PenUsing)
            {
                return;
            }

            if (e.Delta > 0)
            {
                if (zoomListIndex + 1 < zoomList.Length)
                {
                    zoomListIndex++;
                }
            }
            else
            {
                if (zoomListIndex > 1)
                {
                    zoomListIndex--;
                }
            }

            ZoomPerCent = zoomList[zoomListIndex];
            SetCam();
            RefreshOverlay();
            if (Brush != null)
            {
                Brush.Refresh();
            }
            glControl.Refresh();
        }