public interface Entity<K> {
   public K getId();
   public void setId(K value);
}

public interface HasName {
    String getName();
    void setName(String value);
}

public interface NamedEntity<K> extends Entity<K>, HasName
{
}

public interface NamedEntityPropertyAccess extends PropertyAccess<NamedEntity<?>> {
    NamedEntityPropertyAccess INSTANCE = GWT.create(NamedEntityPropertyAccess.class);

    ModelKeyProvider<NamedEntity<?>> id();
    ValueProvider<NamedEntity<?>, String> name();
}

public interface ManagementGroup extends NamedEntity<Integer> {

    Integer getParentId();
    Integer getBusinessUnitId();
    Integer getContactTypeId();
}


_managementGroupStore = new TreeStore<ManagementGroup>(NamedEntityPropertyAccess.INSTANCE.id());
final Tree<ManagementGroup, String> _managementGroupTree = new Tree<ManagementGroup, String>(
                _managementGroupStore, (ValueProvider)NamedEntityPropertyAccess.INSTANCE.name());