How preserve Entityframework SSDL changes?

How ca开发者_如何学运维n I preserve SSDL changes? each time I open Entity framework model designer it overrides and remove my casacade delete attribute added to SSDL manually for many to many relations. I am using Entity framework 4.0 and model first approach.

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You can't. That's a "feature" of the designer.

But the designer will recognize and support cascades if they're in your database. Are they?