protected override void OnLayout(LayoutEventArgs levent)
        {
            //SetBrush();
            // set the size and location for close and auto-hide buttons
            Rectangle rectCaption  = ClientRectangle;
            int       buttonWidth  = ImageCloseEnabled.Width;
            int       buttonHeight = ImageCloseEnabled.Height;
            int       height       = rectCaption.Height - ButtonGapTop - ButtonGapBottom;

            if (buttonHeight < height)
            {
                buttonWidth  = buttonWidth * (height / buttonHeight);
                buttonHeight = height;
            }
            m_buttonClose.SuspendLayout();
            m_buttonAutoHide.SuspendLayout();
            m_buttonWhatIsIt.SuspendLayout();
            Size buttonSize = new Size(buttonWidth, buttonHeight);

            m_buttonClose.Size = m_buttonAutoHide.Size = m_buttonWhatIsIt.Size = buttonSize;

            int   x     = rectCaption.X + rectCaption.Width - 1 - ButtonGapRight - m_buttonClose.Width;
            int   y     = rectCaption.Y + ButtonGapTop;
            Point point = m_buttonClose.Location = new Point(x, y);

            point.Offset(-(m_buttonAutoHide.Width + ButtonGapBetween), 0);
            m_buttonAutoHide.Location = point;
            point.Offset(-(m_buttonWhatIsIt.Width + ButtonGapBetween), 0);
            m_buttonWhatIsIt.Location = point;
            m_buttonClose.ResumeLayout();
            m_buttonAutoHide.ResumeLayout();

            base.OnLayout(levent);
        }