product_labels_tython/wizard/product_product_label_print.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data>

        <record id="product_product_label_view_form" model="ir.ui.view">
            <field name="name">product.product.label.view.form</field>
            <field name="model">product.product.label</field>
            <field name="arch" type="xml">
                <form string="Etiquetas">
                    <group col="4">
                        <field name="label_lines" string="Lineas">
                            <tree editable="bottom">
                                <field name="product_id" string="Producto"/>
                                <field name="quantity" string="Cantidad"/>
                            </tree>
                        </field>
                    </group>
                    <footer>
                        <button string="Imprimir" name="print_labels" type="object" default_focus="1" class="btn-primary"/>
                        <button string="Cancelar" class="btn-default" special="cancel"/>
                    </footer>
                </form>
            </field>
        </record>

        <record id="product_product_label_view_action" model="ir.actions.act_window">
            <field name="name">Etiquetas</field>
            <field name="res_model">product.product.label</field>
            <field name="view_type">form</field>
            <field name="view_mode">form</field>
            <field name="view_id" ref="product_product_label_view_form"/>
            <field name="target">new</field>
        </record>

        <record id="product_product_action_product_product_label" model="ir.values">
            <field name="model_id" ref="product.model_product_product" />
            <field name="name">Etiquetas</field>
            <field name="key2">client_action_multi</field>
            <field name="value" eval="'ir.actions.act_window,' +str(ref('product_product_label_view_action'))" />
            <field name="key">action</field>
            <field name="model">product.product</field>
        </record>

    </data>
</openerp>