If you are running a 64 bit development environment like the rest of the world and have attempted to utilize the Navisworks ViewControl you have probably run into some rather annoying issues. This control will not work in a 64 bit environment at design time in your Visual Studio project, but behold... there is a workaround.
You will need a 32 bit OS where you can install the 32 bit version of Navisworks so you can steal the API dll references that you can use on your 64 bit OS for development. Or if you're super duper lazy, you can just download the one that I'm using and adjust all your Autodesk.Navisworks.Controls references to this 32 bit flavor of the dll for use at design time.
Download the 32 bit control DLL here. Hopefully Autodesk doesn't try to kick my ass for offering this file for download. But after all you can install a 30 day trial to keep this file forever, so no big whoop I guess.
When compiled, the control will work just fine on a 32 bit and 64 bit machine (just like it should otherwise).