jQuery Grid Plugin - jqGrid

Hi, all! I need to reload current level's rows in a treegrid after editing one row's data in modal form in order to represent actual data to the user. Unfortunately I haven't found any method to reload particular level of the treegrid - maybe someone knows? The possible work-around is to store path (array of rowids) to the current row in a variable, call trigger(“reloadGrid”) method to reload entire grid and use gridComplete or loadComplete event to programmatically expand rows according to path stored in variable. But I haven't found method for expanding tree grid row too. Any idea? Thank you much!