Hello Guys

I want to add new Page tab in Product Form View Dynamically With the help of field_view_get() Method

class product_product(osv.osv):
    _inherit = 'product.product'
    def fields_view_get(self, cr, uid, view_id=None, view_type='form', context=None, toolbar=False,submenu=False):
        """
             Changes the view dynamically
             @param self: The object pointer.
             @param cr: A database cursor
             @param uid: ID of the user currently logged in
             @param context: A standard dictionary
             @return: New arch of view.
        """
        ret_val = super(product_product, self).fields_view_get(cr, uid, view_id, view_type, context, toolbar,submenu)
        if view_type == 'form':
            #doc = etree.XML(res['arch'])
            doc = etree.XML(ret_val['arch'], parser=None, base_url=None)
            _moves_arch_lst = """
                <page string='Feature'>
</page>    
            """
            first_node = doc.xpath("//page[@string='Sales']")
            if first_node and len(first_node)>0:  
               #<What Code should I have to write so My Page tab will appear in Product From View>           ret_val['arch'] = etree.tostring(doc, encoding="utf-8")
        return ret_val