Retrieve data from the subgrid

[wymak]

I have subgrid defined under master datagrid 'dg', as follow. How can I retrieve the index of the highlighted row of the subgrid and hence the value of, say, 4th row in the 'Date' column of the expanded subgrid?

Code:

$(function(){
		
		
			$('#dg').datagrid({
				view: detailview,
				detailFormatter:function(index,row){
					return '<div style="padding:2px"><table class="ddv"></table></div>';
				},
				onExpandRow: function(index,row){
					var ddv = $(this).datagrid('getRowDetail',index).find('table.ddv');
					
					ddv.datagrid({
						url: "gettxprog.php?patno=901215&txnum=" + row.txnum,
						//url:'datagrid22_getdetail.php?itemid='+row.itemid,
						fitColumns:true,
						edatagrid:true,
						singleSelect:true,
						rownumbers:true,
						loadMsg:'',
						height:'auto',
						toolbar:subTb,
						columns:[[
							{field:"txdate", title:'Date', width:30, editor:'text'},  
							{field:"descp", title:'Detail', width:80, editor:'text'},  
							{field:"stage", title:'Stage', width:20, editor:'text'},  
							{field:"payway", title:'Pay Method', width:20, editor:'text'},  
							{field:"paid", title:'Paid', width:20, editor:'text'},  
							{field:"dr", title:'Dr', width:20, editor:'text'}  
						]],
						onResize:function(){
							$('#dg').datagrid('fixDetailRowHeight',index);
						},
						onLoadSuccess:function(){
							setTimeout(function(){
								$('#dg').datagrid('fixDetailRowHeight',index);
							},0);
						}
					});
					$('#dg').datagrid('fixDetailRowHeight',index);
				}
			});