hello everyone, I want to hide the edit and create button on the form view for a specific user I use this code but the button not showing at all
i just want to hide buttons just for only group


      <record model="ir.ui.view" id="edit_button_message">
        <record model="ir.ui.view" id="edit_button_message_">

            <field name="name">edit.button.message.1</field>
            <field name="model">person.message</field>
            <field name="inherit_id" ref="view_parent_message_form"/>
            <field name="groups_id" eval="[(6,0,[ref('person_access')])]"/>
            <field name="arch" type="xml">
                <xpath expr="/form[@string='form_view_string']" position="attributes">
                    <attribute name="create">false</attribute>
                    <attribute name="edit">false</attribute>
                </xpath>
            </field>
        </record>

and i use this
    <form string="form_view_string" edit="false" create="false" >

nothing happened , I use odoo v8