code: public void execute(final Instance _instance)
          throws EFapsException
      {
          UIClassification clazz = this;
          while (!clazz.isRoot()) {
              clazz = clazz.getParent();
          }
          clazz.initialized = true;
          for (final UIClassification child : clazz.getChildren()) {
              final Classification type = (Classification) Type.get(child.getClassificationUUID());
              if (clazz.selectedUUID.contains(child.getClassificationUUID())) {
                  child.setSelected(true);
              }
              child.addChildren(child, type.getChildClassifications(), clazz.selectedUUID, _instance);
              clazz.expand();
          }
      }
docs: Execute the model.
  @param _instance Instance
  @throws EFapsException on error