code: protected void executeTree(final Map<Instance, Boolean> _map,
                                 final boolean _expand)
      {
          try {
              final List<Instance> instances = new ArrayList<>();
              for (final Instance inst : _map.keySet()) {
                  instances.add(inst);
              }
              final ValueParser parser = new ValueParser(new StringReader(this.valueLabel));
              final ValueList valuelist = parser.ExpressionString();
              final MultiPrintQuery print = new MultiPrintQuery(instances);
              valuelist.makeSelect(print);
              print.execute();
              while (print.next()) {
                  Object value = null;
                  final Instance instance = print.getCurrentInstance();
                  value = valuelist.makeString(getInstance(), print, getMode());
                  final UIStructurBrowser child = getNewStructurBrowser(instance, this);
                  this.children.add(child);
                  child.setDirection(_map.get(instance));
                  child.setLabel(value.toString());
                  child.setAllowChildren(checkForAllowChildren(instance));
                  if (isAllowChildren()) {
                      child.setParent(checkForChildren(instance));
                  }
                  child.setImage(Image.getTypeIcon(instance.getType()) != null ? Image.getTypeIcon(instance.getType())
                                  .getName() : null);
              }
          } catch (final EFapsException e) {
              throw new RestartResponseException(new ErrorPage(e));
          } catch (final ParseException e) {
              throw new RestartResponseException(new ErrorPage(e));
          }
          sortModel();
          expand(_expand);
          super.setInitialized(true);
      }
docs: This method is called in case of a Tree from the {@link #execute()}method
  to fill this StructurBrowserModel with live.
  
  @param _map      List of Object
  @param _expand   inside an expand