[news.eclipse.modeling.gmf] deleteFromModelAction remove="true" in my pl

[Ralph <ralph.schreder@xxxxxx>]

I have seen another demand for the same theme (deleteFromModelAction 
remove="true" Not working [Please Help]).
I have the same problem and I found no solution.
My code in my plugin.xml shows like that:

  <extension 
point="org.eclipse.gmf.runtime.common.ui.services.action.contributionItemProviders">
    <contributionItemProvider 
class="org.eclipse.gmf.runtime.diagram.ui.providers.DiagramContributionItemProvider" 

      checkPluginLoaded="false">
    <Priority name="Low"/>
    <popupContribution 
class="org.eclipse.gmf.runtime.diagram.ui.providers.DiagramContextMenuProvider"> 

      <popupStructuredContributionCriteria 
objectClass="xxx.gmf.diagram.edit.parts.MyNodeEditPart">
      </popupStructuredContributionCriteria>
      <popupPredefinedItem id="deleteFromDiagramAction" 
remove="true"></popupPredefinedItem>
<popupPredefinedItem id="deleteFromModelAction" 
remove="true"></popupPredefinedItem>
      <popupPredefinedItem
        id="showPropertiesViewAction"
        remove="true">
        </popupPredefinedItem>
      <popupPredefinedItem
        id="properties"
        remove="true">
        </popupPredefinedItem>
    </popupContribution>
     </contributionItemProvider>
  </extension>


Has anybody a solution?

Thanks a lot,
Ralph