hello everyone , i created a new module , i can install it , but the problem is that i cant see the entries on my tree .. Plz plz plz help me

medicalcase.py

from openerp import addons 
from osv import fields, osv
import time

class medicalcase(osv.osv):
    _name='medicalcase'
    _description='dossier medical du patient'

    _columns={
                #info general


                'name' :  fields.char('Numero d`adhesion ', size=30),

                'category_sanguine' : fields.char('Categorie sanguine', size=30, ),

                # maladies
                'maladie_status' : fields.char('Status de la maladie', size=30),
                'date_diagnostique' : fields.date('date de Diagnostique'),
                'age_diagnostique' : fields.char('Age de diagnostique', size=30),
                'severite_maladie' : fields.char('Severite de la maladie', size=30),
                'remarque' : fields.text('Remarque'),
                'retablie' : fields.date('Date de retablissement'),
                'nom_medecin' : fields.char('Nom du medecin', size=30),             
                'alergies' : fields.selection([('Oui','oui'), ('Non','non')],'etes vous allergique?'),
                'allergy_type' : fields.char('Type d`alergie ', size=30),
                'pregnancy_warning' : fields.selection([('Oui','oui'), ('Non','non')],'etes vous enceinte?'),
                'pregnancy_week' : fields.char('Semaine de grossesse ', size=30),
                'on_terapie' : fields.selection([('Oui','oui'), ('Non','non')],'etes vous sous therapie?'),
                'start_terapie' : fields.date('date debut de terapie '),
                'end_terapie' : fields.date('date fin de terapie'),
                'description_terapie' : fields.text('description de la terapie'),
                'extra_info' : fields.text('Extra informations sur le patient'),
                # traitement
                'medicament' : fields.char('medicament', size=30),
                'active' : fields.boolean('active'),
                'debut_traitement' : fields.date('Date de debut de traitement'),
                'fin_traitement' : fields.date('Date de fin de traitement'),
                'medecin' : fields.char('medecin prescrivant le traitement', size=30),
                'indication' : fields.text('Des indications'),
                'tretement_continu' : fields.boolean('traitement continu ?'),
                'tretement_discontinu' : fields.boolean('traitement discontinu ?'),
                'reason_dis' : fields.text('raison de discontinuite ? '),
                'dose' : fields.char('Dosage', size=30),
                'unit_dosage' : fields.char('unite de dosage ', size=30),
                'voie_administration' : fields.char('voie d`administration ', size=30),
                'periode_traitement' : fields.char('periode de traitement ', size=30),
                'frequency' : fields.char('frequence ', size=30),
                'notes' : fields.text('Notes'),


    }

medicalcase()

medical_case.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
<data>
<menuitem name="Gestion medical" id="menu_patients_parent"/>
<menuitem name="Gestion medical" id="menu_patients_parent1" parent="menu_patients_parent"/>
<menuitem name="Divers" id="menu_patients_parent2" parent="menu_patients_parent"/>  

<record model="ir.ui.view" id="medical_tree_view">
    <field name="name">medical.tree</field>
    <field name="model">medical</field>
    <field name="type">tree</field>
    <field name="arch" type="xml">
        <tree string="medical" version="7.0">



                                         <field name="id"/> 
                                        <field name="name"/>


        </tree>
    </field>
</record>
<record model="ir.ui.view" id="medical_form_view">
        <field name="name">medical.form</field>
        <field name="model">medical</field>
        <field name="type">form</field>
        <field name="arch" type="xml">
            <form string="medical" version="7.0">

                <sheet>
                        <notebook>

                            <page string=" Maladies">

                                <group>
                                    <group string=" Information generale">
                                        <field name="name"/>
                                        <field name="maladie_status"/>
                                        <field name="date_diagnostique"/>
                                        <field name="age_diagnostique"/>
                                        <field name="severite_maladie"/>
                                        <field name="remarque"/>
                                        <field name="retablie"/>
                                        <field name="nom_medecin"/>
                                    </group>

                                    <group string="allergies">

                                        <field name="alergies"/>
                                        <field name="allergy_type"/>

                                    </group>

                                    <group string="Grossesses">

                                        <field name="pregnancy_warning"/>
                                        <field name="pregnancy_week"/>

                                    </group>

                                    <group string="Terapie">

                                        <field name="on_terapie"/>
                                        <field name="start_terapie"/>
                                        <field name="end_terapie"/>
                                        <field name="description_terapie"/>
                                    </group>

                                    <group string="Extra informations">

                                        <field name="extra_info"/>

                                    </group>

                                </group>
                            </page>
                            <page string=" Traitements">

                                    <group>
                                        <group string=" Medicament et traitement">
                                            <field name="medicament"/>
                                            <field name="active"/>
                                            <field name="debut_traitement"/>
                                            <field name="fin_traitement"/>
                                            <field name="medecin"/>
                                            <field name="indication"/>
                                            <field name="tretement_continu"/>
                                            <field name="tretement_discontinu"/>
                                            <field name="reason_dis"/>
                                        </group>
                                        <group string=" Dosage">

                                        <field name="dose"/>
                                            <field name="unit_dosage"/>
                                            <field name="voie_administration"/>
                                            <field name="periode_traitement"/>
                                            <field name="frequency"/>


                                        </group>
                                        <group string="Extra informations">

                                            <field name="notes"/>

                                        </group>
                                    </group>
                            </page>

                        </notebook>
            </sheet>    


            </form>
        </field>
</record>



<record model="ir.actions.act_window" id="tens_form">
    <field name="name">medical</field>
    <field name="res_model">medical</field>
    <field name="view_type">form</field>
    <field name="view_mode">tree,form</field>
</record>






<menuitem name="Dossier Medical" parent="menu_patients_parent1" id="notebook_menu" action="tens_form" sequence="1"/>
</data>
</openerp>

plzz help , i can't see the entries on the list view!!!