hi i try to customize a uitabbar

i extended uitabbar item and now have a customized image in it but i cant get rid of the rounded edges.

code:

@interface CustomTabBarItem : UITabBarItem  
{
    UIImage *customHighlightedImage;
}

@property (nonatomic, retain) UIImage *customHighlightedImage;

@end

@implementation CustomTabBarItem

@synthesize customHighlightedImage;

- (void) dealloc
{
    [customHighlightedImage release]; customHighlightedImage=nil;
    [super dealloc];
}

-(UIImage *) selectedImage
{
    return self.customHighlightedImage;
}

@end

maybe somoen knows how to get rid of the rounded rect

around the image

thanks in advance alex