Donut Shape
The following image shows the donut shape applied to a RadPanel:
The following code shows how you can create and apply a DonutShape:
DonutShape donutShape = new DonutShape();
donutShape.Thickness = 50;
radPanel1.RootElement.Shape = donutShape;
radPanel1.RootElement.ApplyShapeToControl = true;
Dim donutShape As New DonutShape()
donutShape.Thickness = 50
radPanel1.RootElement.Shape = donutShape
radPanel1.RootElement.ApplyShapeToControl = True
You can use the Thickness property to adjust the donut width.