checkable : bool This property holds whether the group box has a checkbox in its title. If this property is true, the group box displays its title using a checkbox in place of an ordinary label. If the checkbox is checked, the group box's children are enabled; otherwise they are disabled and inaccessible. By default, group boxes are not checkable. If this property is enabled for a group box, it will also be initially checked to ensure that its contents are enabled.
