A: 

I'm not sure, it might be that you need to set the frame size and/or content size of the scroll view properly. This page has a diagram of what I'm talking about.

slf
Thanks. probably i wasn't clear, but its difficult to explain. the scrollbars appear fine. The problem is my other imageview (one which is not a subview of scrollview) is not recognizing touches. even they are being handled by the scrollview. Thanks anyways.
lostInTransit
A: 

By default UIImageViews have userInteractionEnabled=NO;

Try setting it to YES (either in IB or in code).

Corey Floyd
Thanks. that was it!
lostInTransit