[Paraview] Problem loading custom object panels

[Utkarsh Ayachit]

> That's really annoying, lol. I know that paraview shifted the interface in version 4, I normally wait 1-2 subversions after upgrading a mayor version because of bugs.... But I hope that there is a good migration guide....

You and me both :). It's hard to come up with the generic guide since
it a different way of thinking about things, but I'll be more  than
happy to provide some guidance if and when you get to it.

Utkarsh