BitmapSource SourceStream contains only zeros

Question

I'm trying to use DevExpress ImageEdit control to get access to Image Stream.

I have property ImageSource which is binded to Source property of ImageEdit control:

public BitmapImage ImageSource { get; set; }

Then I'm trying to do following:

byte[] bytes = new byte[255];
ImageSource.StreamSource.Read(bytes, 0, 255);

And the problem is, that this stream contains only zeros. (In example I read 255 bytes, but whole stream is ZERO.

Could you tell me what am I doing wrong? How can I get stream from that?