[news.eclipse.modeling.gmf] ContributionItemService problem

[zzhangh@xxxxxxxxxx (Hao Zhang)]

Hi,
I want to add an editor action to my gmf editor and I found 
contributionItemProviders extension point can be used for this purpose. 
However I tried to mimic logic example without success, the 
"CustomContributionItemProvider" class's createTool() method was never get 
called and of course no editor action showed up. 

I listed the plugin.xml fragment below, anyone can give some suggestion?

  <extension
        id="contribution1"
        name="contribution1"
        
point="org.eclipse.gmf.runtime.common.ui.services.action.contributionItemProviders">
     <contributionItemProvider
           class="com.my.CustomContributionItemProvider">
        <Priority
              name="Low">
        </Priority>
        <partContribution
              class="com.ibm.crl.bo.rule.diagram.part.RuleDiagramEditor">
           <partAction
                 id="exampleAction"
                 menubarPath="/file/print"
                 toolbarPath="/">
           </partAction>
        </partContribution>
     </contributionItemProvider>
  </extension>


Regards,
Hao