after using jTattoo LookAndFeel,
try {
UIManager.setLookAndFeel(new McWinLookAndFeel());
new Main(new UserModel()).setVisible(true);
} ca
I had the same problem and because this API is not enough documented it may be difficult to figure out how to solve this.
The problem comes because the theme overides the standard application bar so the theme has to hide it too. I spent few minutes looking through classes code and I found out this solution. After you set the look and feel if you want to go in fullscreen mode, first you have to remove the border. So before setting:
this.undecorated(true);
remove the borders:
DecorationHelper.decorateWindows(false);
P.S before leaving fullscreen you have to redecorate the window:
DecorationHelper.decorateWindows(true);
It worked for me!