@ Override protected void preparePaintComponent ( final Request request ) { super . preparePaintComponent ( request ) ; // If is an internal AJAX action, set the action type. if ( isCurrentAjaxTrigger ( ) ) { AjaxOperation operation = AjaxHelper . getCurrentOperation ( ) ; if ( operation . isInternalAjaxRequest ( ) ) { // Want to replace children in the target (Internal defaults to REPLACE target) operation . setAction ( AjaxOperation . AjaxAction . IN ) ; } } // Check if a custom tree needs the expanded rows checked TreeItemIdNode custom = getCustomTree ( ) ; if ( custom != null ) { checkExpandedCustomNodes ( ) ; } // Make sure the ID maps are up to date clearItemIdMaps ( ) ; if ( getExpandMode ( ) == ExpandMode . LAZY ) { if ( AjaxHelper . getCurrentOperation ( ) == null ) { clearPrevExpandedRows ( ) ; } else { addPrevExpandedCurrent ( ) ; } } }
Override preparePaint to register an AJAX operation .