I would like to keep the tabs and get rid of the "Scroll Documents Left", "Scroll Documents Right" in the applications

After two days of back and forth, I was finally able to remove the "Scroll Documents Left", "Scroll Documents Right" buttons in the application.

If someone needs to do it as well I used a combination of teh following two sites
http://w.planetnetbeans.org/topic63272.html
https://blogs.oracle.com/geertjan/entry/programmatically_setting_multirow_tabs

My problem now is that the buttons only disappear the first time I run the application after "Cleaning the project" (right click -> clean). All the subsequent times I run the project the buttons still there.

Any idea what I could be missing?