Hide an attribute based on a different attribute entry.

I would like to hide an attribute based on the entry of a different (parent) attribute in the same environment.  Coding wise, everything is working fine and I have the entry being deleted automatically if the entry is not selected to the appropriate entry, but from a GUI standpoint, it just doesn't look "clean" to have a selection box available when it shouldn't be used.

I would be ok with disabling it instead if that's an option.