jQuery Grid Plugin - jqGrid

Hi. I'm using jqGrid 4.0.0. I use tree grid (adjacency model) and toolbar searching. I need the PostData is in key:value pair from toolbar. Toolbar was declared like jQuery("#grid").filterToolbar({stringResult: false}). But PostData is like when stringResult option is true when I use toolbar. And toolbar searching is working fine in simple (non tree) grids. (sorry for my english)