hr_payslip_compute_sheet/views/hr_payslip_views.xml
<?xml version="1.0" encoding="utf-8" ?>
<openerp>
<data>
<record id="hr_payslip_view_tree" model="ir.ui.view">
<field name="name">Inherit HR Payslip Tree</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="//button[@name='compute_sheet']" position="after">
<button
name="%(hr_compute_sheet_action)d"
type="action"
string="Compute Sheet"
states="draft"
class="oe_highlight"
/>
</xpath>
<xpath expr="//button[@name='compute_sheet']" position="attributes">
<attribute name="invisible">True</attribute>
</xpath>
</field>
</record>
</data>
</openerp>