I believe the problem is that @files is not filled in at the time the menus are being built. What you'll need to do is find a way to hook menu selection on the first menu, and install a handler that reconfigures the second menu. Incidentally, you can probably rewrite your file handling code so that it doesn't call ls and so it will actually only find directories. Here's a one-liner illustrating how you might look only at directories: 
print join "\n", grep {-d $_} <*>;

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In reply to Re: Updating one option menu by the value of another by Improv
in thread Updating one option menu by the value of another by meirgold

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