IPhone takes screenshot with UIImagePickerController View - always black if app is TAB

Attempting to take a screenshot when the user is in camera mode and the custom pictures take the picture. I have an application with multiple tabs. In one of them, the user launches the camera. I am using CameraOverViewController to create a custom button to take a snapshot [picker takePicture]. When this picture is taken, I also take the picture using standard methods. This all works fine in a test app without tabs, as soon as I enter tabs it just returns a black square. I understand that it will most likely do the correct view, I cannot figure out which view to get.

    // the view loaded in the tab view 
@interface CameraTestViewController : UIViewController |UIImagePickerControllerDelegate, UINavigationControllerDelegate|

UIImagePickerController *picker

.m
- (void) setUpCamera : (id) sender {
picker = [[UIImagePickerController alloc] init]; 
picker.delegate = self; 
picker.sourceType = UIImagePickerControllerSourceTypeCamera; 
picker.allowsEditing = NO; 
picker.showsCameraControls = NO;
picker.wantsFullScreenLayout = YES;
picker.cameraViewTransform = CGAffineTransformScale(picker.cameraViewTransform, CAMERA_SCALAR, CAMERA_SCALAR);  

CameraOverViewController *createOverlay = [[CameraOverViewController alloc] initWithNibName:@"CameraOverViewController" bundle:nil];    
[createOverlay mainView:self];              
[picker setCameraOverlayView:createOverlay.view];

[self presentModalViewController:picker animated:YES];      
[picker release];

}

- (void) snapThePicture {
    [picker takePicture];
}

// TAKE SCREEN SHOT AS WELL. WORKS WITH NO TABS
- (void)imagePickerController:(UIImagePickerController *)pickerHere didFinishPickingMediaWithInfo:(NSDictionary *)info {
    // tried many, many things. self.view.layer, etc
    CGRect screenRect  = CGRectMake(0, 0, 320, 480);
    UIGraphicsBeginImageContext(screenRect.size);
    [self.picker.view.layer renderInContext:UIGraphicsGetCurrentContext()];

        // UIIMAGE ALWAYS A BLACK RECTANGLE OF RIGHT SIZE. WOULD WORK IF NOT IN TAB VIEW

         UIImage *screenImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
}

      

        
        
        
      

    

Any help is appreciated.

thank.