protected void handleDoubleClick(IStructuredSelection ssel) {
   super.handleDoubleClick(ssel);
   Object selected = ssel.getFirstElement();
   if (selected instanceof SiteFeatureAdapter) {
     IFeature feature = findFeature(((SiteFeatureAdapter) selected).feature);
     FeatureEditor.openFeatureEditor(feature);
   }
 }
 private void handleOpen(IStructuredSelection selection) {
   Object object = selection.getFirstElement();
   if (object instanceof IProductPlugin) {
     ManifestEditor.openPluginEditor(((IProductPlugin) object).getId());
   }
 }