How do I add Damage Type to Power Armor?

[audiodef]

I'm looking at the vanilla power armor in the CK under Items -> Armor -> PowerArmor. Opening PA parts shows the damage resistances in the lower right. I would like to modify these, but nothing actually happens when I select a new resistance to add and give it a value.

 

Select a Damage Type from the drop-down list, type in a Resist value... then what? Clicking OK just closes the window.

 

EDIT: Solved. Finally grew enough of a brain to try right-clicking on things.

Edited May 14, 2018 by audiodef