title: Fixing the maximum size of a JList and changing the look of empty cells
body: <p>I'm working on UI stuff with a JList that can contain at most 8 items. Logically I have prevented the application from adding to the JList once it has reached it's limit, however, I was wondering if there was a way to perhaps explicitly set a limit on the JList itself. Which would help with the next thing I want to do, which is to repaint empty cells (up to 8 cells at most) to indicate that they are empty slots that can be filled. I'm trying to find a way to do this (perhaps by extending ListUI) which does not involve adding placeholder elements into the JList to represent empty spaces.</p>