ure nodes references
      */
      refs: {
        value: {}
      },
      /*
        @property (private) {Object} _misc 
        @description Tree internal used data
      */
      misc: {
        value: {}
      }
    },
    functions: {
      /*
        @function buildStoreTree
        @description Build store based tree structure
      */
      buildStoreTree: function () {
        var el = this;
        if (el.store) {
          var data = el.store.data.asObject();
          // Build tree
          l