Sounds like you have your widgets in currently in screenspace. If you want them 3D you probably want them in world space (again, just out in front of your camera), rotate them there, and then multiply them by your ViewProjection matrix. Your view matrix doesn't make much sense to me, you're treating it like you're still in screen space when you're not.
If this is your first foray into 3D graphics you may want to read up on some linear algebra/matrix transformation tutorials (I don't know any great ones off the top of my head, maybe someone has a good suggestion and can chime in). Or am I misunderstanding your issue?