groupEditor = new RoleAssignmentEditor(presenter, GROUP);
userEditor = new RoleAssignmentEditor(presenter, USER);
roleEditor = new RoleEditor(presenter);
DefaultTabLayoutPanel tabLayoutpanel = new DefaultTabLayoutPanel(40, Style.Unit.PX);
tabLayoutpanel.addStyleName("default-tabpanel");
tabLayoutpanel.add(userEditor, "Users", true);
tabLayoutpanel.add(groupEditor, "Groups", true);
tabLayoutpanel.add(roleEditor, "Roles", true);
tabLayoutpanel.selectTab(0);