[OpenErp client 6.01] how can change active notebook page by button

[Nguyễn Hoàng Thao]

my bug : i want change page in notebook with openerp client 6.01, so what is solution for me?

ex:

I have a <notebook> with two <page> : page 1, page 2 ; and one button

in page1 : i have two <field> with type float : field1 , field2
in page 2 : has <field> result total two field in page1, name field3

and, my button has use to sum value of field1 and field2 to field3 when i click

problem in here is when i click on button, i want page2 is show(focus) for me see the result .

I feel very difficult to do this, I hope you give me the solution. thanks

code:
<notebook>
   <page string="page1">
        <field name="field1" />
        <field name="field2" />
   </page>
   <page string="page2">
        <field name="field3" />
   </page>
</notebook>
</newline/>

<button name="button_total" string="Total" type="object" icon="terp-report"/>