~therp-nl/therp-addons/7.0_lp1219418

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

<openerp>

    <data>

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

            <field name="model">mail.message</field>

            <field name="inherit_id" ref="mail.view_message_form"/>

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

                <sheet position="before">

                    <header attrs="{'invisible': [('model', '!=', 'fetchmail.inbox.invoice')]}">

                        <button string="Attach to existing invoice" type="object" name="fetchmail_inbox_attach_existing" class="oe_highlight" />

                        <button string="Create invoice" type="object" name="fetchmail_inbox_create" />

                    </header>

                </sheet>

            </field>

        </record>

    </data>

</openerp>