oportunity_calendar_in_dashboard/views/oportunity_calendar.xml

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

        <record id="action_oportunity_calendar" model="ir.actions.act_window">
            <field name="name">Calendario de Oportunidades</field>
            <field name="type">ir.actions.act_window</field>
            <field name="res_model">crm.lead</field>
            <field name="view_type">form</field>
            <field name="view_id" ref="crm.crm_case_calendar_view_leads"/>
            <field name="view_mode">calendar,form,tree,kanban</field>
            <field name="search_view_id" ref="crm.view_crm_case_opportunities_filter"/>
        </record>

        <menuitem id="menu_organizer"
                name="Organizador" parent="eiru_dashboard.eiru_dashboard_menu"
                sequence="50"/>

        <menuitem id="menu_oportunity_calendar"
                action="action_oportunity_calendar" parent="menu_organizer"
                sequence="1"/>

    </data>
</openerp>