eiru_crm/views/crm_task_view.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
  <data>
    <record model="ir.ui.view" id="crm_task_form">
      <field name="name">crm_task_form</field>
      <field name="model">crm.task</field>
      <field name="type">form</field>
      <field name="arch" type="xml">
        <form>
          <header>
            <field name="state" clickable="True" widget="statusbar"/>
          </header>
          <sheet>
            <group>
              <field name="task_type_id" widget="radio" required='True'/>
            </group>
            <group>
              <field name="name"/>
              <field name="date_action_next"/>
              <field name="user_id"/>
              <field name="partner_id"/>
              <field name="opportunity_id"/>
              <field name="description"/>
            </group>
          </sheet>
          <!-- <footer>

            <button name="write" string="Crear" type="object" class="oe_highlight"/> or
              <button type="cancel" string="Cancelar" class="oe_form_button_cancel"/>
          </footer> -->
        </form>
      </field>
    </record>

    <record id="task_filter" model="ir.ui.view">
      <field name="name">CRM - Opportunities Search</field>
      <field name="model">crm.task</field>
      <field name="arch" type="xml">
        <search string="Search Opportunities">
          <field name="partner_id" string="Cliente" filter_domain="[('partner_id','ilike',self)]"/>
          <field name="opportunity_id" string="Oportunidad"/>
          <field name="state" string="Estado"/>
          <field name="user_id" string="Responsable"/>
          <field string="Tipo de Tarea" name="task_type_id"/>
          <filter string="Mis Tareas" name="assigned_to_me"
                          domain="[('user_id', '=', uid)]"
                          help="Tasks that are assigned to me"/>
          <group expand="0" string="Group By">
           <filter name="group_by_customer" string="Cliente" context="{'group_by':'partner_id'}"/>
           <filter name="group_by_seller" string="Responsable" context="{'group_by':'user_id'}"/>
           <filter name="group_by_type" string="Tipo de Tarea" context="{'group_by':'task_type_id'}"/>
           <filter name="group_by_state" string="Estado" context="{'group_by':'state'}"/>
         </group>
        </search>
      </field>
    </record>

    <record id="crm_task_calendar" model="ir.ui.view">
      <field name="name">Calendario de Tareas</field>
      <field name="model">crm.task</field>
      <field name="type">calendar</field>
      <field name="arch" type="xml">
        <calendar color="task_type_id" date_start="date_action_next" date_stop="" string="Tareas" event_open_popup="%(crm_task_form)s" >
          <field name="name"/>
          <field name="hex_value"/>
        </calendar>
      </field>
    </record>

    <record model="ir.ui.view" id="crm_task_tree">
      <field name="name">crm_task_tree</field>
      <field name="model">crm.task</field>
      <field name="type">tree</field>
      <field name="arch" type="xml">
        <tree string="Oportunidades" colors="red:expired_date == True and state == 'pending';gray:state == 'cancel';green:state == 'pending'">
          <field name="task_type_id"/>
          <field name="date_action_next"/>
          <field name="description"/>
          <field name="user_id"/>
          <field name="partner_id" />
          <field name="state"/>
          <field name="expired_date" invisible='1'/>
          <button name="action_done" string="Done" type="object" icon="gtk-apply" help="Done" attrs="{'invisible':[('state','!=','pending'),('state','!=','cancel')]}"/>
          <button name="action_done" string="Pending" type="object" icon="gtk-undo" help="Pending" attrs="{'invisible':[('state','!=','done')]}"/>
          <button name="action_cancel" string="Cancel" type="object" icon="gtk-cancel" help="Cancel" attrs="{'invisible':[('state','=','cancel')]}"/>

        </tree>
      </field>
    </record>

    <record id="crm_task_from_partner" model="ir.actions.act_window">
      <field name="name">Tareas</field>
      <field name="res_model">crm.task</field>
      <field name="view_type">form</field>
      <field name="view_mode">calendar,tree,form</field>
      <field name="context">{"search_default_state":'pending', 'search_default_user_id': uid}</field>
      <field name="search_view_id" ref="task_filter"/>
      <field name="help" type="html">
        <p class="oe_view_nocontent_create">
          Click to create a new task.
        </p>
      </field>
    </record>

    <record model="ir.actions.act_window.view" id="action_crm_task_calendar">
      <field name="sequence" eval="1"/>
      <field name="view_mode">calendar</field>
      <field name="view_id" ref="crm_task_calendar"/>
      <field name="act_window_id" ref="crm_task_from_partner"/>
    </record>

    <record model="ir.actions.act_window.view" id="action_crm_tree_task">
      <field name="sequence" eval="2"/>
      <field name="view_mode">tree</field>
      <field name="view_id" ref="crm_task_tree"/>
      <field name="act_window_id" ref="crm_task_from_partner"/>
    </record>

  <!-- Tree Wizard view from kanban -->

  <record id="tree_wizard_filter" model="ir.ui.view">
    <field name="name">tree_wizard_filter</field>
    <field name="model">crm.task</field>
    <field name="arch" type="xml">
      <search string="Search Task">
      </search>
    </field>
  </record>

  <record id="action_tree_wizard" model="ir.actions.act_window">
    <field name="name">Tareas</field>
    <field name="res_model">crm.task</field>
    <field name="view_type">form</field>
    <field name="view_mode">tree</field>
    <field name="target">new</field>
    <field name="search_view_id" ref="tree_wizard_filter"/>
    <field name="domain">[('opportunity_id', '=', active_id),('state','=','pending')]</field>
  </record>

 </data>
</openerp>