I have created a new model called "car.services". Whenever i create a new record, it is not showing in tree view.

class car_services(orm.Model):

_name = 'car.services'

_columns = {

      'name': fields.char('Name'),

     'active': fields.boolean('Active'),

     'car_no': fields.char('Car Number')

     'start_date': fields.date('Start Date'),

     'end_date':fields.date('End Date'),

     'type':fields.selection([('normal', 'Normal'), ('priority', 'Priority'), ('disc', 'Discount')], 'Type',                     required=True),

  }