NSFormatter not getting called

[Apple Cocoa List]

I can't get this very simple NSFormatter to get called on an  
NSTextField.

Here is the formatter:
@implementation FileNameFormatter
- (BOOL)isPartialStringValid:(NSString *)partialString  
newEditingString:(NSString **)newString errorDescription:(NSString  
**)error
{
        NSLog(@"Formatter called");  //NEVER GETS CALLED.
        return YES;
}
@end

Here is my code assigning it to an NSTextField:
- (void)windowDidLoad
{
        NSLog(@"windowDidLoad called");  //GETS CALLED OK.
	FileNameFormatter *fileNameFormatter = [[[FileNameFormatter alloc]  
init] autorelease];
        [nameField setFormatter:fileNameFormatter];
}

Is there anything I am missing?

Thanks,

Todd Freese
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