Thank you very much zentara for your quick help. I am aware of the Tk::Itemstyle technique to 'condition' the Hlist widget. However, it does not provide options for callbacks on the specified widget (or maybe I'm wrong).
Is it possible to include a callback to a subroutine for the Hlist item on a row basis ?? Say for example, I would like to display details of the current entry (like row no,etc).