Custom Button in Crystal Report Viewer

Hi Everyone,

I'm using Crystal Reports 2011 for all my reports and templates. I have a Java / J2EE web application which will display these reports. I need to have custom buttons for custom functionalities (like exporting to custom quicken format, custom banking formatted files, etc). I have the back end functionalities ready in Java and all I need is to invoke those methods and classes from the Crystal Viewer through some button event click, etc.

Can you please help me with codebase or pointers & guidance to go about achieving this functionality using the report viewer or BO enterprise Java SDK - having my own custom button in the Crystal Viewer and then clicking them to call my own classes and methods ?

Thanks a lot to everyone in advance.