Rui::Widget::Group - composite widget with label and border
$group = $someWindow->Group;
$group->layoutManager(name => 'grid', numCols => 3);
$group->value('A Group');
$group->Label(value => 'foo');
the Rui::Widget::Panel manpage
A group is just a panel with a border. You can set a text value that will be displayed on the border.