payroll_print/views/payroll_print.xml

<?xml version="1.0" encoding="UTF-8"?>
<openerp>
    <data>
        <record id="views_payroll_print" model="ir.ui.view">
            <field name="name">hr.payslip.print</field>
            <field name="model">hr.payslip</field>
            <field name="inherit_id" ref="hr_payroll.view_hr_payslip_form"/>
            <field name="arch" type="xml">
                <xpath expr="//div[@class='oe_right oe_button_box']" position="before">
                    <div class="oe_right oe_button_box payroll_button_box" id="print_payroll"></div>
                </xpath>
            </field>
        </record>
	</data>
</openerp>