public SliceRootNode(
     @NotNull Project project,
     @NotNull DuplicateMap targetEqualUsages,
     final SliceUsage rootUsage) {
   super(
       project,
       new SliceUsage(rootUsage.getElement().getContainingFile(), rootUsage.params),
       targetEqualUsages);
   myRootUsage = rootUsage;
 }
 @Override
 public void customizeCellRenderer(
     @NotNull SliceUsageCellRenderer renderer,
     @NotNull JTree tree,
     Object value,
     boolean selected,
     boolean expanded,
     boolean leaf,
     int row,
     boolean hasFocus) {
   renderer.setIcon(getPresentation().getIcon(expanded));
   if (isValid()) {
     SliceUsage sliceUsage = getValue();
     renderer.customizeCellRendererFor(sliceUsage);
     renderer.setToolTipText(sliceUsage.getPresentation().getTooltipText());
   } else {
     renderer.append(
         UsageViewBundle.message("node.invalid") + " ",
         SliceUsageCellRenderer.ourInvalidAttributes);
   }
 }
 @Override
 public void navigate(boolean requestFocus) {
   SliceUsage sliceUsage = getValue();
   sliceUsage.navigate(requestFocus);
 }