/// <summary>
 /// Set transparent the background of the active document
 /// </summary>
 /// <param name="app">Photoshop Application object</param>
 public static void SetBckgTransparentAction(ref ps.ApplicationClass app)
 {
     // Call action already stored in photoshop
        app.DoAction(_transparentBckgActionName,_transparentBckgActionFolder);
 }