Flickering on ScrollableControl placed on a SplitContainer Panel

Hi,

We have placed ScrollableControl within one of the SplitterContainer panel. AutoScrolling is enabled on the ScrollableControl as well as DoubleBuffering.

We have some static drawing to be drawn in a fixed (absolute) position and some drawing to be drawn considering the Scroll position (relative to the view).

As scrolled, it appears as all the drawing is moving for a moment and redrawn again as expected.

Is there any way flickering can be avoided when scrolling?

The control in the following code is placed on one of the panel of a SplitContainer in a form.

    class GraphView : ScrollableControl
    {
        int X = 200;
        int Y = 50;
        int newval = 0;
        int _StartDev = 0;

        public void Draw(Graphics Gx)
        {
            //Force to Display Scroll
            AutoScrollMinSize = new Size(X, 1000);
            
            if (VerticalScroll != null && VerticalScroll.Visible)
            {
                VerticalScroll.SmallChange = 34;
            }


            DrawTitle(Gx);
            DrawTextinRec(Gx);
        }

        //Display "Title" at this fixed position (45,0), regarless of Scrolling
        void DrawTitle(Graphics Gx)
        {
            Font ft = new Font("Arial", 10, FontStyle.Bold);
            Rectangle rc = new Rectangle(45, 0, this.Width, 50);
            Gx.DrawString("Title", ft, Brushes.Black, rc);
            ft.Dispose();
        }

        void DrawTextinRec(Graphics Gx)
        {
            Font ft = new Font("Arial", 10, FontStyle.Bold);

            //Scroll This text only
            Rectangle rc = new Rectangle(X, Y - newval, 50, 110);
            Gx.DrawRectangle(Pens.Black, rc);

            StringFormat SF = new StringFormat();
            SF.LineAlignment = StringAlignment.Center;
            Gx.DrawString("This is the test window", ft, Brushes.Black, rc, SF);

            ft.Dispose();
        }

        private void InitializeComponent()
        {
            this.SuspendLayout();
            // 
            // GraphView
            // 
            this.Scroll += new System.Windows.Forms.ScrollEventHandler(this.GraphView_Scroll);
            this.ResumeLayout(false);
        }

        private void GraphView_Scroll(object sender, ScrollEventArgs e)
        {
            if (e.ScrollOrientation == ScrollOrientation.VerticalScroll)
            {
                newval = e.NewValue;

                if (VerticalScroll == null)
                    return;

                Int32 y = e.NewValue;
                Int32 yMax = VerticalScroll.Maximum;
                Int32 iStartDevOrig = y / 34;

                switch (e.Type)
                {
                    case ScrollEventType.First:
                        y = 0;
                        break;
                    case ScrollEventType.Last:
                        y = Int32.MaxValue;
                        break;
                    case ScrollEventType.SmallDecrement:
                        y -= VerticalScroll.SmallChange;
                        break;
                    case ScrollEventType.SmallIncrement:
                        y += VerticalScroll.SmallChange;
                        break;
                    case ScrollEventType.LargeDecrement:
                        y -= VerticalScroll.LargeChange;
                        break;
                    case ScrollEventType.LargeIncrement:
                        y += VerticalScroll.LargeChange;
                        break;
                    case ScrollEventType.ThumbTrack:
                        y = e.NewValue;
                        break;
                }
                if (y < 0)
                    y = 0;
                else if (y > yMax)
                    y = yMax;
                _StartDev = y / 34;


                newval = e.NewValue = _StartDev * 34;
                Invalidate();
            }

            Refresh();
        }

        protected override void OnPaint(PaintEventArgs e)
        {
           base.OnPaint(e);
           Draw(e.Graphics);
        }
    }

Thank you.
Regards,
NaderUK