customize uipopovercontroller in ipad

Question

i want to change the image of popover. it is having blue tint at the top so i want it to be of different color. how can i do it...

- (void)presentPopoverFromRect:(CGRect)rect inView:(UIView *)view permittedArrowDirections:(UIPopoverArrowDirection)arrowDirections  animated:(BOOL)animated

can i do it with this method.. make my own view and place a image in that view.

i read in some posts that it is not possible to change color and also i didnt fine any instance method of UIPopOverController class to do this..

thanks in advance.