<action>
    <field name="string">Visits</field>
    <field name="view_cls">multi_view</field>
    <field name="model">clinic.visit</field>
    <field name="tabs">[["All",[]],["Pending",[["state","=","pending"]]],["Confirmed",[["state","=","confirmed"]]],["Cancelled",[["state","=","cancelled"]]]]</field>
     <field name="modes">list,calendar,form</field>
    <field name="menu">clinic_menu</field>
</action>