<form model="clinic.period">
<head>
<button string="Options" dropdown="1">
<!--<item string="Copy" method="copy"/>-->
</button>
</head>
<group form_layout="stacked">
<field name="name" span="2"/>
<field name="date_start" span="2"/>
<field name="date_stop" span="2"/>
<field name="nmonth" span="2"/>
<field name="last_period_id" span="3"/>
<field name="lines" nolabel="1">
<list>
<field name="date_start"/>
<field name="date_stop"/>
<field name="day_total"/>
<field name="close"/>
</list>
</field>
</group>
<foot>
<button string="Generate" type="default" icon="arrow-right" method="gen_period"/>
</foot>
</form>