
      Example: A "Buy" button in a store application.
    </li>
    <li> 
      When quick access to the command is important and going to the menu would be
      tedious or slow.<br>
      Example: Next/Previous buttons or Zoom In/Out buttons in an image viewing application.
    </li>
    <li>
      When in the middle of an operation that needs to be completed.<br>
      Example: Save/Discard buttons in an image crop activity.
    </li>
    <li>
      Dialogs and wizards.<br>
      Example: OK/Cancel butt