If the event receiver modifies a boxes, this member indicates the top-level box that needs to be updated for consistency against the output stream.

public Box DirtyBox { get; set; }

Public Property DirtyBox As Box
	Get
	Set

public:
property Box^ DirtyBox {
	Box^ get ();
	void set (Box^ value);
}

member DirtyBox : Box with get, set