odoo 8收音机小部件不是水平的

Question

这是xml代码。我无法水平获取单选按钮。只有文本水平显示，但按钮垂直显示。但它适用于Odoo 9。

<record id="view_employee_form_inherited" model="ir.ui.view">
     <field name="name">hr.employee.form.inherited</field>
     <field name="model">hr.employee</field>
     <field name="inherit_id" ref="hr.view_employee_form"/>
     <field name="arch" type="xml">
         <xpath expr="//field[@name='work_phone']" position="after">
            <group string="Employee Rating">
                <div><h4> Rating Scale: </h4><p> 1. Needs Improvement  2. Average  3. Good   4. Excellent  5. Extrodinary </p></div>
            </group>
            <group><field name="rating" widget="radio"  options="{'horizontal': true}"/></group>
         </xpath>
     </field>
</record>