title: symfony 1.4: trying to manage the credentials of the actions
body: <p>we want to manage the credentials of the actions of the backend from
  the backend.</p>
  
  <p>How to get the list of the actions of an app? After that we could show
  the credential of each one through getCredential().</p>
  
  <p>2nd question: i found the function to get the credential of an action
  (getCredential()), but how to <em>set</em> the credentials? I didn't find any
  setCredential() function...</p>
  
  <p>Javi</p>