public override string ToString()
{
StringBuilder sb = new StringBuilder();
sb.AppendFormat("{0}: ControlDelta {1:d}/{2:d}, AnchorDelta {3:d}/{4:d}", this.GetType().ToString(),
this._controlDeltaX, this._controlDeltaY, this._anchorDeltaX, this._anchorDeltaY);
return sb.ToString();
}