Custom JMI implementation

Hi,
I've been reading the document on how to customize JMI implementation.
I ran the example of the ModelElement class but I'm not sure that this
will solve my initial problem.
I designed an UML metamodel in ArgoUML and then transformed it to MOF
metamodel. My resulting mof package is called ProjectPackage. I want to
add some contraint checkings to this package whenever i call the
refVerifyConstraints(boolean) method, for example, checking that every
class in my mof package has an atribute called "name".

My ProjectPackage generated jmi class is in the package
org.netbeans.jmi.project

This is how i tried to implement it, so that i can check contraints,
according to what i read in the document:

package org.netbeans.jmiimpl.project;

import org.netbeans.mdr.handlers.*;
import org.netbeans.jmi.project.*;
import org.netbeans.mdr.storagemodel.*;
import java.util.Collection;

public abstract class ProjectPackageImpl extends InstanceHandler
implements
        ProjectPackage {
    protected ProjectPackageImpl(StorableObject storable) {
        super(storable);
    }
    protected Collection _verify(Collection verify) {
        super._verify(verify);
        // do your stuff here
        return verify;
    }
}

The thing is, when i obtain the package instance:
ProjectPackage project =
(ProjectPackage)repository.getExtent("project");

Where the "project" extent is where i loaded my mof metamodel, it
brings me the autogenerated JMI implementation, and never references my
class (i now this because i debugged it with some breakpoints).
Is what i am trying to do possible? Is the way i am trying to do it
wrong?

Thanks,
Viviana
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