title: Confirming a dialogue box on a condition and with dynamic text in openerp
body: <p>I found that the below pops me up a confirmation dialogue on button press action in openerp</p>
  
  <pre><code>&lt;button name="action_button_confirm" states="draft" string="Confirm Sale" 
  type="object" groups="base.group_user" confirm="Do you confirm this sale?"/&gt;
  </code></pre>
  
  <p>I would like the confirm text to be displayed only if one of the products in the orderlines is service and the text should be</p>
  
  <pre><code>Do you like to confirm sale with service "AC Service"?
  </code></pre>
  
  <p>Where Ac Services is the service product name (i.e dynamic text based on the orderlines). Kindly suggest me a way to do this. Thanks</p>