public NavigationElement(
     NavigationElements navElement,
     String displayText,
     String requiredPermission,
     ILabelResolver labelResolver) {
   this(navElement.getNavigationOutcome(), displayText, requiredPermission, labelResolver);
 }
 /**
  * @param navElement
  * @param resolver
  */
 public NavigationElement(NavigationElements navElement, ILabelResolver resolver) {
   this(navElement.getNavigationOutcome(), null, navElement.getNeededPermission(), resolver);
 }