Extjs4中用combox做下拉带图片的下拉框

var states = Ext.create('Ext.data.Store', {
		    fields: ['url', 'name'],
		    data : [
		        {"url":"花地1.jpg", "name":"Alabama"},
		        {"url":"花地1.jpg", "name":"Alaska"},
		        {"url":"花地1.jpg", "name":"Arizona"}
		        //...
		    ]
		});

		Ext.create('Ext.form.ComboBox', {
		    fieldLabel: 'Choose State',
		    store: states,
		    displayField: 'name',
		    queryMode: 'local',
		    renderTo: Ext.getBody(),
		    listConfig: {
		        getInnerTpl: function() {
		            return '<div data-qtip="{name}"><img src="{url}" width="16" height="16"> {name}</div>';
		        }
		    }
		});
	});