text: 
  /*!
  @project    NavigatorKit
  @header     NKSplitViewPopoverButtonDelegate.h
  @abstract	Based on Malcolm Crawford's devforums.apple.com posts.
  */
  
  #import <UIKit/UIKit.h>
  
  /*!
  @protocol NKSplitViewPopoverButtonDelegate <NSObject>
  @abstract A protocol detail view controllers implement to hide and show the bar button 
  item controlling the popover.
  @discussion Allows detail controller implemention use the bar button item a
  view controllers UIToolbar or UINavigationBar or the UINavigationItem for the 
  view controller if within a navigation controllers.
  */
  @protocol NKSplitViewPopoverButtonDelegate <NSObject>
  -(void) showMasterPopoverButtonItem:(UIBarButtonItem *)barButtonItem;
  -(void) invalidateMasterPopoverButtonItem:(UIBarButtonItem *)barButtonItem;
  @end
  