java JQGrid TreeGrid - expand node after reloadgrid - jqgrid

Question

ON select row i m calling
$('#grid').trigger('reloadGrid');
after which when the grid reloads, i want this node expanded and show children.
i tried doing somethinglike
var rootNode = $('#grid').jqGrid('getRowData')[0];
$('#grid').jqGrid('expandRow' ,rootNode);
$('#grid').jqGrid('expandNode' ,rootNode);
$('#grid').jqGrid('setSelection',rootNode.id);
But this doesnt seem like working,
Any Help is appreciated.
My grid object is as below
var grid = $('#grid').jqGrid({
treeGrid: true,
treeGridModel: 'adjacency',
ExpandColumn: 'businessAreaName',
ExpandColClick : false,
url:'/records.do',
datatype: 'json',
mtype: 'GET',
colNames:['Id'
, 'Business Area'
, 'Investment'
],
colModel:[
/*00*/ {name:'Id',index:'Id', width:0, editable:false,hidden:true},
/*01*/ {name:'businessAreaName',index:'businessAreaName', width:160, editable:false}
],
treeReader : {
level_field: 'level',
parent_id_field: 'parent',
leaf_field: 'leaf',
expanded_field: 'expanded'
},
autowidth: true,
height: 240,
pager: '#pager',
sortname: 'id',
sortorder: 'asc',
caption:'ATP ScoreCard',
emptyrecords: 'Empty records',
loadComplete: function() {
designtable();
},
jsonReader : {
root: 'rows',
page: 'page',
total: 'total',
records: 'records',
repeatitems: false,
cell: 'cell',
id: 'agileProgrammeId'
},
beforeProcessing : function(data, status, xhr){
}
}
});

Answer 1

First of all there are hidden expanded column which you can fill in the (see here and here). So if you include the children of the node which you need to open directly after the to opened node and set expanded: true in its properties the tree node will be displayed opened.
It can be that you want to trace which nodes opens the user and restore the nodes at the next visit of the same page. In the case I would forward you to the answer and to this one.