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dismissing modalview is not working
- (void)displayModalViewaction: (id) sender
 {
self.view = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

self.viewController = [[Infoviewcontroller alloc] init];

[self.view setFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];


UINavigationController *navigationController=[[UINavigationController alloc] init];

navigationController.navigationBar.tintColor = [UIColor brownColor];

[navigationController pushViewController:_viewController animated:YES];

[self.view addSubview:navigationController.view];

[_viewController release];

[navigationController release];

}

@protocol ModalViewDelegate <NSObject>

 -(void) dismissModalView:(UIViewController *) viewController;

 @end

 @interface Infoviewcontroller : UIViewController <ModalViewDelegate>

 {
    id<ModalViewDelegate> dismissDelegate;
  }

@property (nonatomic, retain) id<ModalViewDelegate> dismissDelegate;

@end

@synthesize dismissDelegate;

-(void) dismissModalView:(UIViewController *) viewController;
{

   [self dismissModalViewControllerAnimated:YES];

 }
  @end

   -(void) dismissView: (id)sender

  {
    [delegate dismissModalView:self];

 }

 -(void) dismissModalView:(UIViewController *) viewController;
{

 [self.dismissModalViewController Animated:YES];

}

@end

UIButton* backButton = [UIButton buttonWithType:101];
  [backButton addTarget:self action:@selector(dismissView:)   forControlEvents:UIControlEventTouchUpInside];
  [backButton setTitle:@"Done" forState:UIControlStateNormal];

// create button item
UIBarButtonItem* backItem = [[UIBarButtonItem alloc] initWithCustomView:backButton];

// add the button to navigation bar
self.navigationItem.leftBarButtonItem = backItem;
[backItem release];

[navigationController presentModalViewController:_viewController animated:YES];

[self.navigationController popViewControllerAnimated:YES];

[self dismissModalViewControllerAnimated:YES];