Box manipulators broken on WRF data

[sgpearse]

Platform: OSX

To reproduce:

1. Import katrina, create a volume renderer, and go to the geometry tab
2. Right click on the interactive Box manipulators to resize the data region. Sometimes they work and sometimes they don't, even when turning yellow which indicates they are activated.

[sgpearse]

@NihanthCW @StasJ @shaomeng - Hey guys, I just wanted to call attention to this. It's a really important feature, especially for the Image renderer, and is embarrassing to use during tutorials.