Hello Gabor,
Thanks for your response. The link that you provided says to uncheck 'enableDefaultLeadSelection'. I had a look at the component customizing and it is already unchecked. Also, the issue that i face is, Lead selection is not getting removed, when i click on 'Refresh' button on right bottom of POWL list. As mentioned above, method HANDLE_ACTION doesn't get called while this refresh is triggered manually.
Best Regards,
Gaurav.