Another minor thing, the button behaves differently from the buttons in the built in path controls. Clicking the button will always trigger the file dialog prompt, versus the other buttons which won't open the dialog if the Mouse Up doesn't happen on the button.
Update: Fixed file posted below:
Here's a new version of that control that should fix the issue.
Replace the file, here, and you'll be all set:
<LabVIEW>\resource\JKI\Design Palette\Themes\JKI Flat UI 2.0\Path--File-Browse-Folder-Location-Simple.ctl
We'll have this fixed in the next official release of the JKI Flat UI Controls 2.0. Thanks again for your attention to these little details.