hide button in workflow openerp

Question

I have workflow with 4 states : new ,negotiation,won,lost and a button . I want my button only visible in state won and invisible in other state .

Here my code

<button string="Nhập kho" name="themkho" type="object" attrs="{'invisible': [('state','in',['new','negotiation','lost'])]}"/>

Sorry , i don't have enough reputation to post image

1 - how can i hide my button when i create ?

2- how can i use my button only 1 time and afterthat it will invisible for all state ?

3- how can hide edit button in state negotiation,won and lost ?

user1576199 user1576199 · Accepted Answer · 2014-11-22T14:42:23

Why you not add states attribute in button like this:

<button string="Nhập kho" name="themkho" type="object" **states="won"**/>

Regards,