iOS Using DROP PIN in iphone app

Hi
I want to use a drop pin in my iphone application to mark location in images.(just as a pin is dropped on google map to mark the location).
But I don't know which control from Iphone SDK framework shoul be used for this and how.
Please help me and/or give me any useful link to this explaining the usage.
Your help will be greatle appreciated.
Regards,
Mukesh

Thanks a lot. But as I am new to Iphone progrmming, Can you please guide me how to start with the advanced image processing features for iPhone? Please provide me any link or pointers to understand the topic clearly.

Creating a calloutView with image

I created a callout view in my iphone application(like one on Google map, where a disclosure button is associated with the

pin and on pin touch the callout view with disclosure button pops up). Following the example in iphone Developer's cookbook I

was able to create a calloutView with a message and a disclosure button but my requirement is now to create a similar popup

with image in the callout view (in place of string) and withot disclosure button.

Can anyone please help me how to fix this?

Your help will be greatly appreciated.

Regards,
Mukesh