def fields_view_get(self, cr, uid, view_id=None, view_type='form', context=
    None, toolbar=False, submenu=False):
    res = models.Model.fields_view_get(self, cr, uid, view_id=view_id,
        view_type=view_type, context=context, toolbar=toolbar, submenu=submenu)
Odoo/OpenERP: hiding create button from treeview