If I use method CFbsBitmap::Save(filename), It work's corectly.

But I need store CFbsBitmap to stream (stream is open to file) so i open stream

RWriteStream::Create(RFS, filename, iFlags)
RWriteStream::Open(RFS, filename, iFlags)

Stream to file is open

Now I wanna store CFbsBitmap to stream I use CFbsBitmap::ExternalizeL(RWriteStream)

It store some data almost the same amout like CFbsBitmap::Save(filename)
Something missing, probaply header or

Could you advise how to store CFbsBitmap to stream and after that I can use mbmviewer from SDK and I can see it?