setAddExternalCourse(null);
setExternalCourse(null);
    public VigilancyCourseGroupBean() {        setSelectedUnit(null);        setSelectedVigilantGroup(null);        setSelectedDepartment(null);        setSelectedCompetenceCourseGroupUnit(null);        setAddExternalCourse(null);        courses = new ArrayList<DomainReference<ExecutionCourse>>();        coursesToAdd = new ArrayList<DomainReference<ExecutionCourse>>();    }