<?xml version="1.0"?>
<search string="Mass Mailing Statistics">
                    <field name="name" string="Mailing"/>
                    <field name="campaign" string="Campaign" groups="mass_mailing.group_mass_mailing_campaign"/>
                    <filter name="filter_scheduled_date" date="scheduled_date"/>
                    <group expand="0" string="Extended Filters...">
                        <field name="scheduled_date"/>
                    </group>
                    <group expand="1" string="Group By...">
                        <filter string="Mass Mailing Campaign" domain="[]" name="mass_mailing_campaign" context="{'group_by':'campaign'}" groups="mass_mailing.group_mass_mailing_campaign"/>
                        <filter string="State" domain="[]" name="state" context="{'group_by':'state'}"/>
                        <filter string="Sent By" domain="[]" name="sent_by" context="{'group_by':'email_from'}"/>
                        <separator/>
                        <filter string="Scheduled Period" name="scheduled_date" domain="[]" context="{'group_by':'scheduled_date'}"/>
                    </group>
                </search>
            