public void retrieve() {

		if (FacesContext.getCurrentInstance().isPostback()) {
			return;
		}
		if (this.id == null) {
			this.groupBE = this.example;
		} else {
			this.groupBE = groupService.findGroup(id);
			if (groupBE == null) {
				groupBE = new GroupBE();
				example = new GroupBE();
			}
		}
	}