Code

public void assignNodeToPart(BR_Shape child_shape, Point coord_then, Point coord_else, Point coord_bottom, Point snapPoint)
        {
            double height_to_add = child_shape.Bounds.Height - 20;
            if (snapPoint.Equals(coord_then))
            {
                this.Then_connected_node = child_shape;
                resizeHeight(height_to_add);
            }
            else if (snapPoint.Equals(coord_else))
            {
                this.Else_connected_node = child_shape;
                resizeHeight(height_to_add);
            }
            else
                this.connected_node = child_shape;
        }

        private void resizeHeight(double height_to_add)
        {
            // Change the bounds of the node according to the size of the child node
            if (lastInflatedNode != this)
            {
                if (lastInflatedNode != null)
                    lastInflatedNode.Bounds = lastBounds;

                Rect r = this.Bounds;
                lastBounds = r;
                this.Bounds = new Rect(r.X, r.Y, r.Width, r.Height + height_to_add);
                lastInflatedNode = this;
            }
        }