Embedded viewport in popup window

I’d like to create a popup window form, where part of the form displays a custom “User Control” which is a Rhino viewport, displaying meshes etc. Something like akin to this:

http://docs.mcneel.com/rhino/5/help/en-us/commands/newfloatingviewport.htm

But inside of a popup Windows .NET form instead?

It is currently not possible to embed a “live” Rhino view in .NET form. Why do you need to do this?

It has been on our wishlist for a while, but requires quite a bit of changes to our low level code. Hopefully this will be more possible in V6.