[news.eclipse.modeling.gmf] how to show a menu when select attribute/cla

[aojw2008@xxxxxxxxx (Bill Grand)]

Hi,

I add below extension to show a menu when user right click the 
class/attribute name within a class. I use the EAttribute class the 
enablement condition, but it doesn't work, please help, thanks.
  <extension
        point="org.eclipse.ui.popupMenus">
     <objectContribution
           adaptable="true"
           id="xxx.objectContributions.BGAssignToGlossary"
           
objectClass="org.eclipse.gef.editparts.AbstractGraphicalEditPart">
        <action
              class="xxx.actions.BGAssignToGlossary"
              definitionId="xxx.commands.BGAssignToGlossary"
              enablesFor="+"
              id="xxx.actions.BGAssignToGlossary"
              label="Assign to glossary term¡­"
              menubarPath="editMenu/additions">
           <enablement>
              <objectClass
                    name="org.eclipse.emf.ecore.EAttribute">
              </objectClass>
           </enablement>
        </action>
     </objectContribution>
  </extension>
  <extension
        point="org.eclipse.ui.commands">
     <command
           categoryId="org.eclipse.ui.category.edit"
           description="Assign to glossary term..."
           id="xxx.commands.BGAssignToGlossary"
           name="Assign to glossary term¡­">
     </command>
  </extension>