code: function getSelectableElements(element) {
      var out = [];
      var childs = element.children();
      for (var i = 0; i < childs.length; i++) {
          var child = angular.element(childs[i]);
          if (child.scope().isSelectable) {
              out.push(child);
          } else {
              if (child.scope().$id!=element.scope().$id && child.scope().isSelectableZone === true) {
  
              } else {
                  out = out.concat(getSelectableElements(child));
              }
          }
      }
      return out;
  }
docs: Angular JS multiple-selection module
  @author Maksym Pomazan
  @version 0.0.3