agile.xml

<?xml version="1.0"?>
<tryton>
    <data>
        <record model="ir.ui.view" id="agile_task_form">
            <field name="model">project.work</field>
            <field name="type">form</field>
            <field name="inherit" ref="project.work_view_form" />
            <field name="arch" type="xml">
                <![CDATA[
                    <data>
                        <xpath
                        expr="/form/field[@name='sequence']" position="after">
                        <label name="category"/>
                        <field name="category"/>
                        </xpath>
                        <xpath expr="/form/notebook/page[@id='general']" 
                        position="after">
                        <page string="Children" id="children"
                        states="{'invisible': Not(Equal(Eval('type'),
                         'story'))}">
                        <field name="children_story" colspan="4"/>
                        </page>
                        </xpath>
                    </data>
                ]]>
            </field>
        </record>
  
        <record model="ir.ui.view" id="agile_task_tree">
            <field name="model">project.work</field>
            <field name="type">tree</field>
            <field name="inherit" ref="project.work_view_list"/>
            <field name="arch" type="xml">
                <![CDATA[
                <data>
                <xpath expr="/tree/field[@name='state']" position="after">
                    <field name="category"/>
                </xpath>
                </data>
                ]]>
            </field>
        </record>
      
        <record model="ir.action.act_window" id="act_story_tree">
            <field name="name">Stories</field>
            <field name="res_model">project.work</field>
            <field name="domain">[('type', '=', 'story')]</field>
            <field name="context"></field> 
        </record>

        <menuitem parent="project.menu_project_tree" action="act_story_tree" 
        id="menu_story_tree"/>
    </data>
</tryton>