MaxForm no longer works in VS Designer?

I used to have no problems coding up a MaxForm object in Visual Studio…

These days? I have to set it up as a standard Form, then switch everything over to MaxForm before I build because the Designer totally fails to load the object as a MaxForm.

I’m currently using VisualStudio 2015 Community edition (working from home, out of a job and doing some part-time contract work), though this was happening in VS 2012 Professional as well.

Any ideas?