api.cs

// create a drawing control that contains the shape(s)
TXTextControl.Drawing.TXDrawingControl drawing =
    new TXTextControl.Drawing.TXDrawingControl(3000, 3000);

// create a new donut shape
TXTextControl.Drawing.Shape shape =
    new TXTextControl.Drawing.Shape(TXTextControl.Drawing.ShapeType.Donut);

// set the color and border width
shape.ShapeFill.Color = Color.Red;
shape.ShapeOutline.Color = Color.Yellow;
shape.ShapeOutline.Width = 200;

// add the shape to the drawing control
drawing.Shapes.Add(
    shape, 
    TXTextControl.Drawing.ShapeCollection.AddStyle.Fill);

// create a new drawing frame object from the created drawing control
TXTextControl.DataVisualization.DrawingFrame frame = 
    new TXTextControl.DataVisualization.DrawingFrame(drawing);

// add the frame to the document
textControl1.Drawings.Add(frame, -1);