Field declaration for combogrid may be written as follows:
{field:'secode2',title:'Section',width:100,align:'left',
						editor:{
			    				type:'combogrid',
			    				options:{
			    					idField: 'secode2', textField: 'section',
												url: 'getSection.php',
												mode: 'remote',
												fitColumns:true,
												columns: [[
													{field:'secode2',title:'SeCode',width:60,align:'right'},
													{field:'secode',width:0,hidden:true},
													{field:'section2',width:0, hidden:true},
													{field:'section',title:'Section',width:260},
													{field:'deptname',title:'Department',width:200}
												]],
									panelHeight:135
			    				}
						}
					}