odoo/addons/portal/wizard_view.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data>
        <!-- wizard action on res.partner -->
        <act_window id="partner_user_wizard_action"
            name="Create Portal User"
            src_model="res.partner"
            res_model="res.portal.user_wizard"
            view_type="form" view_mode="form"
            key2="client_action_multi" target="new"/>

        <!-- wizard action on res.partner.address -->
        <act_window id="address_user_wizard_action"
            name="Create Portal User"
            src_model="res.partner.address"
            res_model="res.portal.user_wizard"
            view_type="form" view_mode="form"
            key2="client_action_multi" target="new"/>

        <!-- user_wizard view -->
        <record id="user_wizard_view" model="ir.ui.view">
            <field name="name">Create Portal User</field>
            <field name="model">res.portal.user_wizard</field>
            <field name="type">form</field>
            <field name="arch" type="xml">
                <form string="Create Portal User">
                    <group colspan="2" col="2">
                        <field name="name"/>
                        <field name="email"/>
                        <field name="lang"/>
                        <field name="address_id"/>
                    </group>
                    <group colspan="2" col="2">
                        <field name="portal_id"/>
                    </group>
                    <label colspan="2"/>
                    <button string="Cancel" special="cancel" icon="gtk-cancel"/>
                    <button string="Create User" name="do_create" type="object" icon="gtk-ok"/>
                </form>
            </field>
        </record>
    </data>
</openerp>