How do I get rid of the filler maps?

[Frubbs]

[url]http://gyazo.com/860de5b25558e01be3cae7936e8dc992[/url]

In ULX the "Maps" tab, I don't want these filler maps there, how do I remove them?

[Netheous]

These aren't 'filler' maps, they are there because ULX also reads maps shipped/provided by included TF2 content.
If you don't want ULX to show them - get rid of tf2 or modify ULX to fit your liking.