python - how to add a button in custom openerp module -

hi having error while adding button of type action .i cannot view button . following vetclinic_view.xml

<record id="vetclinic_breed_action" model="ir.actions.act_window">          <field name="name">breed</field>          <field name="res_model">vetclinic.breed</field>          <button name="add_field" string="add field" type="object"  class="oe_highlight" />          <field name="view_type">form</field>          <field name="view_mode">tree,form</field>          <field name="help" type="html">                 <p class="oe_view_nocontent_create">click create record.</p>          </field> 

here vetclinic.py

class vetclinic_breed(osv.model): _name="vetclinic.breed" _columns={      'name':fields.char('name',size=32),               } def add_field(cr,self,uid,id): 

that may in vetclinic_view.xml file window action, not view. note model attribute of record element.

you need add button view, not action. window action responsible triggering view display isn't view.