Hello Pavan,
Handle it as an user command.Create an User command for the search button (binoculars) in the standard toolbar section of your custom status .
Sometime back I had replied to a requirement to implement the search functionality
by using custom code. You could then call this as needed from PAI. However there might be an issue , when multiple grids are displayed on one screen, as you might not know for which grid you would want the help to get triggered for. I tried this and it is working fine for me.
http://scn.sap.com/thread/3278471
Hope this helps.
Thanks,
Venkat.
Message was edited by: Venkat Gowrishankar