How do I implement an image button in BlackBerry?
Use RIM's Advanced UI Pack.
http://supportforums.blackberry.com/t5/Java-Development/Implement-advanced-buttons-fields-and-managers/ta-p/488276
This contains a BitmapButton field and a great number of of useful UI tools.
(No doubt Reflogs example is good, but I think for new BB developers landing on this page the Advanced UI pack is more beneficial)