/**
* Adds a new tab button.
*
* @param icon button icon
* @return button
*/
private BaseXButton tabButton(final String icon) {
final BaseXButton b = new BaseXButton(gui, icon, null);
b.border(2, 2, 2, 2).setContentAreaFilled(false);
b.setFocusable(false);
return b;
}
