code: private AptControlImplementation initSuperClass()
      {
          if ( _implDecl == null || _implDecl.getSuperclass() == null )
              return null;
          
          ClassDeclaration superDecl = _implDecl.getSuperclass().getDeclaration();
          if (superDecl != null && 
              superDecl.getAnnotation(org.apache.beehive.controls.api.bean.ControlImplementation.class) != null)
          {
              return new AptControlImplementation(superDecl, _ap);
          }
          
          return null; 
      }
docs: Initializes the super interface that this ControlImpl extends (or null if a
  base class)