NSObject. Dirty Mark
Promotes a regular peer object (IsDirectBinding is true) into a toggleref object.
protected void MarkDirty ();
member this.MarkDirty : unit -> unit
This turns a regular peer object (one that has
IsDirectBinding set to true) into a toggleref object. This
is necessary when you are storing to a backing field whose
objc_c semantics is not copy or retain. This is an internal