Saving my own created entites while updating in EDMX

I have created my own entities in edmx i.e. temp table for开发者_运维问答 a stored procedure. Now when i update my EDMX and adds or update any table, the entity which i created (for temp table) is removed from SSDL portion.

Is there any way that my changes are not lost. Mean can extend EDMX or any other way.....

Thanks...

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This is a known problem of Update model from database wizard. All manual changes in the model are discarded.
It was not fixed in VS 2010 RTM.