Dear All,
I made a js library for extending a combogrid into a datagrid editor based on 
http://www.jeasyui.com/forum/index.php?topic=478.0.
Library jquery.combogrid.js:
(function($) {
	$.extend($.fn.datagrid.defaults.editors, {
		combogrid: {
			init: function(container, options) {
				var input = $('<input type="text" class="datagrid-editable-input">').appendTo(container);
				input.combogrid(options);
				return input;
			},
			destroy: function(target) {
				$(target).combogrid('destroy');
			},
			getValue: function(target) {
				return $(target).combogrid('getValue');
			},
			setValue: function(target, value) {
				$(target).combogrid('setValue', value);
			},
			resize: function(target, width) {
				$(target).combogrid('resize', width);
			}
		}
	});
})(jQuery);
  Combogrid editor declaration:
					<th data-options="field:'pickWarehouseCode',width:200,sortable:'true',
							formatter:function(value,row){
								return row.Gudang;
							},
							editor:{
								type:'combogrid',
								options:{
									panelWidth:260,
									idField:'Kode',
									textField:'Gudang',
									required:true,
									columns:[[
										{field:'Kode',title:'Kode',width:60},
										{field:'Gudang',title:'Gudang',width:200}
									]],
									onSelect: onSelectGrid,
									filter: function(q,row){
										var opts = $(this).combogrid('options');
										return row[opts.textField].toUpperCase().indexOf(q.toUpperCase()) >= 0;
									},
									data: gudangList
								}
							}">Pick WH</th>
Handler for combogrid.onSelect event:
			function onSelect(record) {
				var cb = $(this);
				var index = getRowIndex(cb);
				var row = dg.edatagrid('getRows')[index];
				var field = cb.combobox('options').textField;
				row[field] = record[field];
			}
			function onSelectGrid(record) {
				var cb = $(this);
				var index = getRowIndex(cb);
				var row = dg.edatagrid('getRows')[index];
				var field = cb.combogrid('options').textField;
				row[field] = record[field];
			}
The problem is my onSelectGrid function failed to retrieve the combogrid's options. The error message is: 
TypeError: $.data(...) is undefined.    
var opts=$.data(jq[0],"combogrid").options;. 
I have included my working combobox.onSelect event handler. Thank you.
Regards,
Alex Wijoyo