I put some shapes onto the document, then serialize the ActiveLayer of current document and save it to a file.

After I deserialize from the FileStream and get NLayer instance (nLayerInstance), Then

CurrentNDrawingDocument.Layers.AddChild(nLayerInstance);

nLayerInstance.BringToFront();

Then the shape appears. But cannot be selected.

In this case, if I call "NDrawingDocument.ActiveLayer", I will get "null".

does anybody have meet this problem? How did you resolved? Thanks