code: function(name, value, refresh) {
          this.root.setNodesProperty(name,value);
          if (refresh) {
              this.root.refresh();
          }
      }
docs: Sets the value of a property for all loaded nodes in the tree.
  @method setNodesProperty
  @param name {string} Name of the property to be set
  @param value {any} value to be set
  @param refresh {boolean} if present and true, it does a refresh