Hi Andy,

What you are looking at here is the ScrollbarIntersectionUIElement. There aren't any Appearance properties that affect this area, but you can set it's color in a number of ways.

One way to do this is via Application Styling. But it would be a lot of work to use AppStyling just to style one tiny little element like this.

Another option would be to use a DrawFilter. This is much easier. Here's some sample code.

    public class MyDrawFilter : IUIElementDrawFilter
    {

        #region IUIElementDrawFilter Members

        bool IUIElementDrawFilter.DrawElement(DrawPhase drawPhase, ref UIElementDrawParams drawParams)
        {
            if (drawParams.Element is ScrollbarIntersectionUIElement)
            {
                switch (drawPhase)
                {
                    case DrawPhase.BeforeDrawBackColor:
                        drawParams.AppearanceData.BackColor = Color.Blue;
                        break;
                }
            }

            return false;
        }

        DrawPhase IUIElementDrawFilter.GetPhasesToFilter(ref UIElementDrawParams drawParams)
        {
            if (drawParams.Element is ScrollbarIntersectionUIElement)
                return DrawPhase.BeforeDrawBackColor;

            return DrawPhase.None;
        }

        #endregion
    }

You assign the DrawFilter to the grid like this:

this.ultraGrid1.DrawFilter = new MyDrawFilter();

You can do this in the form constructor or in the Form_Load.