~vauxoo/addons-vauxoo/6.0-trunk

<?xml version='1.0' encoding='UTF-8'?>

<openerp>

    <data>

        <record id="view_inherit_purchase_button_send_email_form" model="ir.ui.view">

            <field name="name">view.purchase.button.send.email.form</field>

            <field name="model">purchase.order</field>

            <field name="inherit_id" ref="purchase.purchase_order_form"/>

            <field name="arch" type="xml">

                <xpath expr="//button[@name='wkf_send_rfq']" position="replace">

                                                        <button name="wkf_send_rfq" states="draft" string="Send by Email" type="object" context="{'send_rfq':True}" class="oe_highlight" groups = "group_button_wkf_send_rfq.group_button_send_email"/>

                </xpath>

            </field>

        </record>

    </data>

</openerp>