NSAlert with NSTimer

Hi,

 I am facing a problem to display NSAlertPanel dialog with NSTimer.

Actually, I need to display a alert panel which show the remaining time to happened something(like restart the system). My problem is- it is not updating the time until I click on any button of panel. Here is the code I am using-

[self remainingTime: 30];

- (void) remainingTime: (int) timeOut

{

msg = [NSString stringWithFormat: @"%d seconds remaining", timeOut];

NSRunAlertPanel(@"temp",msg , @"Accept", nil, @"Reject");

NSTimer* myTimer = [NSTimer timerWithTimeInterval: 1

target: self selector: @selector(timeUpdater:)

userInfo : nil repeats: NO];

[myTimer fire];

[[NSRunLoop currentRunLoop] addTimer: myTimer forMode:NSModalPanelRunLoopMode];

}

- (void) timeUpdater: (NSTimer*) theTimer

{

timeOut--;

if(timeOut <= 0)

        [theTimer invalidate];

[self remainingTime: timeOut];

}

any help will be highly appreciated

Thanks!