title: How to hide or disable "Edit" button in Odoo 9
body: <p>Can anyone help me how to hide or disable Edit and/or Create button when my workflow status value is "Done"</p>
  
  <p>I have workflow status "Draft > Approval > Confirmed > Done"</p>
  
  <p>so when status is Done i want 'Edit' to be hidden or disabled.</p>
  
  <p>Please help. thanks in advance.</p>