odoo/addons/account/wizard/account_invoice_refund_view.xml

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

        <record id="view_account_invoice_refund" model="ir.ui.view">
            <field name="name">account.invoice.refund.form</field>
            <field name="model">account.invoice.refund</field>
            <field name="type">form</field>
            <field name="arch" type="xml">
                <form string="Credit Note">
                    <separator string="This wizard is used to refund the invoice" colspan="4"/>
                    <group colspan="4" >
                         <label string="Are you sure you want to refund this invoice ?" colspan="2"/>
                         <newline/>
                         <field name="date"/>
                         <field name="period"/>
                         <field name="description"/>
                    </group>
                    <separator colspan="4"/>
                    <group col="4" colspan="4" fill="1">
                        <label align="0.0" width="300" string="Refund Invoice: creates a refund invoice"/>
                        <label align="0.0" width="500" colspan="4" string="Cancel Invoice: creates a reverse accounting entries to cancel the invoice"/>
                        <label align="0.0" width="550" colspan="4" string="Modify Invoice: creates a refund invoice, and new copy of the same invoice ready for editing"/>
                    </group>
                    <separator colspan="4"/>
                    <group colspan="4" col="6">
                        <label string ="" colspan="2"/>
                        <button icon="gtk-cancel" special="cancel" string="Cancel"/>
                        <button icon="gtk-redo" string="Refund Invoice" name="invoice_refund" type="object"/>
                        <button icon="gtk-ok" string="Cancel Invoice" name="invoice_cancel" type="object"/>
                        <button icon="gtk-undo" string="Modify Invoice" name="invoice_modify" type="object"/>
                   </group>
               </form>
            </field>
        </record>

        <record id="action_account_invoice_refund" model="ir.actions.act_window">
            <field name="name">Credit Note</field>
            <field name="res_model">account.invoice.refund</field>
            <field name="view_type">form</field>
            <field name="view_mode">tree,form</field>
           <field name="view_id" ref="view_account_invoice_refund"/>
           <field name="target">new</field>
        </record>


    </data>
</openerp>