Code does not work

Code:

 # pragma mark - 
# Pragma mark UITextViewDelegate 

- (Void) doneEditting: (id) sender {

[TextViewContent resignFirstResponder]; 
self.navigationItem.rightBarButtonItem = nil; 
} 

- (Void) textViewDidBeginEditing: (UITextView *) textView {

self.navigationItem.rightBarButtonItem = [[[UIBarButtonItem alloc] 
initWithTitle: @ "Done" 
style: UIBarButtonItemStyleDone 
target: self 
action: @ selector (doneEditting :)] 
autorelease]; 
} 

Did not add a text Done button in the navigation bar above.
How it happened?
Reply:
Hello ~
System comes ~
"Done" button
UIBarButtonItem * aItme = [[UIBarButtonItem alloc] initWithBarButtonSystemItem: UIBarButtonSystemItemDone target: self action: @ selector (doneEditting :)];
self.navigationItem.rightBarButtonItem = aItem;
[AItem release];

Hope that helps