iOS How to customize UIImagePickerController

[anuhoho]

HI

I want to make an application which can customize the UIImagePickerCOntroller class.

Till now what I did is

			//create an overlay view instance
			PhotoLayoutView* overlay = [[PhotoLayoutView alloc]initWithFrame:CGRectMake(0, 0, 320, 480)];
			
			// create the picker
			UIImagePickerController* picker1 = [[UIImagePickerController alloc] init];
			//[picker1 setAllowsEditing:YES];
			[picker1 setSourceType:UIImagePickerControllerSourceTypeCamera];
			[picker1 setDelegate:self];
			
			//hide all controls
			picker1.showsCameraControls = NO;
			picker1.navigationBarHidden = YES;
			picker1.toolbarHidden = YES;
			//make the video preview full size
			picker1.wantsFullScreenLayout = YES;
			picker1.cameraViewTransform =
			CGAffineTransformScale(picker1.cameraViewTransform,
								   1,
								   1.34299);
			//set our custom overlay view
			picker1.cameraOverlayView = overlay;
			[self presentModalViewController:picker1 animated:YES];
			[picker1 release];

PhotoLayout is another class for the overlay which has a button

- (id)initWithFrame:(CGRect)frame {
    if (self = [super initWithFrame:frame]) {
        //clear the background color of the overlay
        self.opaque = NO;
        self.backgroundColor = [UIColor clearColor];

		
        //add a simple button to the overview with no functionality at the moment
        ScanButton *scanButton = [[ScanButton alloc] initWithFrame:CGRectMake(10, 400, 157, 50)];
		
		// Add a target action for the button:
		[scanButton addTarget:self action:@selector(btnClicked) forControlEvents:UIControlEventTouchUpInside];
		
		 [self addSubview:scanButton];
    }
    return self;
}

- (void) btnClicked {

}

ScanButton class is where I put the image to the button

@implementation ScanButton

- (id)initWithFrame:(CGRect)frame {
	if (self = [super initWithFrame:frame]) {
		// Set button image:
		UIImageView *buttonImage = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 157, 57)];
		buttonImage.image = [UIImage imageNamed:@"capture.png"];
		
		//[self addTarget:self action:@selector(buttonPressed) forControlEvents:UIControlEventTouchUpInside];
		
		// TODO: Change opacity when being touched:
		
		[self addSubview:buttonImage];
		
	}
	return self;
}

My first problem is the button is not showing in the view when i open the camera second is how can I call the takePicture method of UIImagePickerController with the btnClicked button in PhotoLayout class.