private void polygonRibbonButton_Click(object sender, EventArgs e) { UnselectAllTools(); btnPolygon.Checked = true; Polygon p = new Polygon(null); p.SetPoints(new PointF[] { new PointF(0, 0), new PointF(0, 40), new PointF(40, 40), new PointF(40, 0), new PointF(0, 0) }); mParent.SetEditorTool(new DrawEditorTool(p, false)); }