Extjs 单选按钮

{
            xtype: 'radiogroup',
            fieldLabel: '并发症标识来源',
            name: 'rb-auto',
            id: 'rgUsedType',
            width: 260,
            items: [
                { boxLabel: '基础表', name: 'rgUsedTypeGroup', inputValue: 1, checked: true },
                { boxLabel: '关系表', name: 'rgUsedTypeGroup', inputValue: 2 },
            ]

        },

取值: var sh = Ext.getCmp('rgUsedType').getValue();