/// <summary>
 /// Process Document.
 /// Status is set by process
 /// </summary>
 /// <returns>new status (In Progress or Invalid)</returns>
 public String PrepareIt()
 {
     if (!IsValidAction(ACTION_PREPARE))
     {
         return(_status);
     }
     if (_document != null)
     {
         _status = _document.PrepareIt();
         _document.SetDocStatus(_status);
     }
     return(_status);
 }