public void OnMouseUp(object sender, MouseEventArgs e)
        {
            if (lineConnector != null)
            {
                IDrawingObject temp = this.TargetCanvas.SelectObjectAt(e.Location);
                if (temp == null)
                {
                    this.TargetCanvas.RemoveDrawingObject(lineConnector);
                }
                else
                {
                    lineConnector.B = temp;
                    lineConnector.B = temp;

                    lineConnector.Deselect();
                    this.TargetCanvas.RemoveDrawingObject(lineConnector);
                    this.TargetCanvas.AddDrawingObjectAt(0, lineConnector);
                    lineConnector = null;
                }
            }
        }