How to group custom markers in a custom view?

I am creating an eclipse plug-in that verifies XML and XSL code by applying some specific rules, and which generates some custom error markers (ex: Error, Warning, Info) in a custom view (called PCC Markers).

I create my markers like this :

marker = resource.createMarker("pccplug.myMarker");
        marker.setAttribute(IMarker.MESSAGE, message);
        marker.setAttribute(IMarker.LINE_NUMBER, line);
        marker.setAttribute(IMarker.SEVERITY, IMarker.SEVERITY_ERROR);

Here is my plugin.xml :

<extension point="org.eclipse.ui.ide.markerSupport">
   <markerField class="pccplug.views.Recommendations" id="champRecommendations"
          name="Recommendatio开发者_Python百科ns" /> 
   <markerContentGenerator id="pccplug.views.myCustomMarkerGenerator" 
          name="My Marker Generator">
     <markerTypeReference id="pccplug.coolMarker" /> 
     <markerFieldReference id="org.eclipse.ui.ide.severityAndDescriptionField"/> 
     <markerFieldReference id="org.eclipse.ui.ide.resourceField" /> 
     <markerFieldReference id="org.eclipse.ui.ide.pathField" /> 
     <markerFieldReference id="org.eclipse.ui.ide.locationField" /> 
     <markerFieldReference id="org.eclipse.ui.ide.markerType" /> 
     <markerFieldReference id="org.eclipse.ui.ide.priorityField" /> 
     <markerFieldReference id="champRecommendations" /> 
   </markerContentGenerator>
</extension>

My problem is that all the errors are not grouped, they are all one after the other : My current output

And I would like to have them grouped by categories (ex: SEVERITY or PRIORITY), as it is already the case in the Problems View : My desired output

How can I create these groups of markers (I tried almost every MarkerField,Type,Group, but I couldn't do it) ?

Does anyone has any idea on how to do that ?

---

Your current output and desired output are the same, so I guess you have achieved what you need already ;-)

You have to specify defaultMarkerGrouping in your markerContentGenerator. As in:

    <extension point="org.eclipse.ui.ide.markerSupport">
       <markerContentGenerator id="pccplug.views.myCustomMarkerGenerator" 
              defaultMarkerGrouping="org.eclipse.ui.ide.severity"
              name="My Marker Generator">

... others here ...
       </markerContentGenerator>
    </extension>