The first thing I'd change is to use a JDialog and not a JFrame so it stays in front of the main window. You don't need to make it modal though.
I'll tinker with it. But I think of JDialog as a tool for putting up a little "confirm this" type window. On the other hand, the Matrix image/folder settings window is a monster, with multiple tabs, all kinds of listeners, navigation to next/previous objects, window titles that match the file/folder name, and so on. Take a look at it sometime.
On top of that, this is all a "TomCee Special," and I don't pretend to understand a fair chunk of what's in there.