don't think so.
I'm using Magic Library (www.dotnetmagic.com) to achive that effect.
Note about Magic that it have some annoying bugs, so I don't know if you should use it.
As far as I know that isn't a way to do so
Actually all I had to do was make the parent of the form equal to the tabpage. I am working on my own custom tab control that utilizes this in addition to making it look more like the dev studio tabs.
I recently received a question regarding this thread. I've created a test rpoject that creates one parent Form, then attaches two MDI child forms. One of the child Forms has two tabs on it.
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