Panels- How can I show the related terms pane only if the term being displayed has only the root as parent? I am using the awesome Panels module to override the default taxonomy display.  I am using the Related Terms content pane (built-in to Panels) to show children of the current term.

My vocabulary looks like this:


Country
State
City


What I would like to do is show the child terms (related terms pane) only for countries, not states or cities.  In other words, I would like to show the related terms pane if and only if the term has no parents except the root parent.

However, the only Visibility Rule that seems to apply is Term has Parent(s), which requires a user-created term (not the root term) to be selected.  I could select all of the terms and then check Reverse, but I have hundreds of locations and more are being added all the time, making this unfeasible.  Is there some other way?
I wrote something quick together over in Different variant for other Taxonomy hierarchy within vocabulary, that gives a selection rule for the term level.

It sounds like that would help you.