Menus for VCS plugins

I am trying to build a new VCS plugin for IDEA; it's going ok, but I added a menu and it is always disabled!


I have

    <group id="Rtc.Menu" popup="true" text="_RTC">
      <reference id="UpdateFiles"/>

     <add-to-group group-id="VcsGroup" anchor="last"/>
     <add-to-group group-id="VcsGroups" anchor="last"/>
    </group>


and

/**
* RTC VCS menu
*/
public class RtcMenu extends StandardVcsGroup {
  @Override
  public AbstractVcs getVcs(Project project) {
    return RtcVcs.getInstance(project);
  }

  @Override
  public String getVcsName(final Project project) {
    return RtcVcs.NAME;
  }
}

and the StandardVcsGroup.update(AnActionEvent e) is setting the presentation to visible & enabled.

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Also, where are the standard actions e.g. "UpdateFiles" and groups, e.g. "VcsGroup", or "VcsGroups" documented - I just copied these from the GIT one.