protected void buttonEditShape_Click(object sender, EventArgs e)
        {
            LayerOverlay dynamicOverlay = (LayerOverlay)Map1.CustomOverlays["DynamicOverlay"];
            InMemoryFeatureLayer shapeLayer = (InMemoryFeatureLayer)dynamicOverlay.Layers["shapeLayer"];

            foreach (Feature feature in shapeLayer.InternalFeatures)
            {
                Map1.EditOverlay.Features.Add(feature.Id, feature);
            }

            shapeLayer.InternalFeatures.Clear();
            Map1.EditOverlay.TrackMode = TrackMode.Edit;
            if (Map1.EditOverlay.Features.Count > 0)
            {
                foreach (Feature item in Map1.EditOverlay.Features)
                {
                    PolygonShape itemShape = item.GetShape() as PolygonShape;
                    if (itemShape != null && PolygonIsRectangleShape(itemShape))
                    {
                        Map1.EditOverlay.EditSettings.IsRotatable = false;
                        break;
                    }
                    else
                    {
                        Map1.EditOverlay.EditSettings.IsRotatable = true;
                    }
                }
            }
            dynamicOverlay.Redraw();
        }

        private bool PolygonIsRectangleShape(PolygonShape polygon)
        {
            Collection<Vertex> ourerRingVertices = polygon.OuterRing.Vertices;
            if (ourerRingVertices.Count == 5
                && Math.Abs((ourerRingVertices[0].X - ourerRingVertices[2].X)) == Math.Abs((ourerRingVertices[1].X - ourerRingVertices[3].X))
                && Math.Abs((ourerRingVertices[0].Y - ourerRingVertices[2].Y)) == Math.Abs((ourerRingVertices[1].Y - ourerRingVertices[3].Y))
                )
            {
                return true;
            }
            return false;
        }