server-tools/fetchmail_attach_from_folder/view/fetchmail_server.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data>
        <record model="ir.ui.view" id="view_email_server_form">
            <field name="name">fetchmail.server.form</field>
            <field name="model">fetchmail.server</field>
            <field name="type">form</field>
            <field name="inherit_id" ref="fetchmail.view_email_server_form" />
            <field name="arch" type="xml">
                <data>
                    <field name="object_id" position="attributes">
                        <attribute name="attrs">{'required': [('type', '!=', 'imap')]}</attribute>
                    </field>
                    <xpath expr="//page[@string='Server &amp; Login']/group[3]" position="after">
                        <group col="2" colspan="2" attrs="{'invisible': [('type','!=','imap')]}">
                            <separator string="Folders to monitor" colspan="2"/>
                            <field
                                name="folder_ids"
                                nolabel="1"
                                colspan="2"
                                on_change="onchange_server_type(type, is_ssl, object_id)">
                                <tree editable="bottom">
                                    <field name="sequence" invisible="1" />
                                    <field name="path" />
                                    <field name="model_id" />
                                    <field name="model_field" />
                                    <field name="match_algorithm" />
                                    <field name="mail_field" />
                                    <field name="delete_matching" />
                                    <field name="flag_nonmatching" />
                                    <field name="match_first" />
                                    <field
                                        name="model_order" 
                                        attrs="{'readonly': [('match_first','==',False)], 'required': [('match_first','==',True)]}" />
                                    <field name="domain" />
                                    <button type="object"
                                        name="button_attach_mail_manually"
                                        string="Attach mail manually"
                                        icon="gtk-redo" />
                                </tree>
                            </field>
                        </group>
                    </xpath>
                </data>
            </field>
        </record>
    </data>
</openerp>