function _childBeginExpand( ev ) {
    if ( _isAccordion ) {
      if ( _lastOpenChild ) {
        _lastOpenChild.collapse();
      }
      _lastOpenChild = ev.target;
    }
  }
/**
   * Handle opening event of a child Expandable instance.
   * @param {Object} ev An object that references the event target.
   */
Handle opening event of a child Expandable instance.
@param {Object} ev An object that references the event target.
Handle opening event of a child Expandable instance . @param { Object } ev An object that references the event target .
function _childBeginExpand( ev ) {
    if ( _isAccordion ) {
      if ( _lastOpenChild ) {
        _lastOpenChild.collapse();
      }
      _lastOpenChild = ev.target;
    }
  }
function _childBeginExpand ( ev ) { if ( _isAccordion ) { if ( _lastOpenChild ) { _lastOpenChild . collapse ( ) ; } _lastOpenChild = ev . target ; } }
Handle opening event of a child Expandable instance.
Handle opening event of a child Expandable instance .