How to determine what row/column user clicked in a crosstab from a deck

[kgcognos]

Hi,

This is my first time creating active reports.

I have a deck containing 1 crosstab.
The crosstab displays the item class and customer class sales summary by region.
(It contains X no of item class as rows and X no of customer class as rows. This Yr $, Last Yr $, % Growth as columns)

1. i want user to be able to select any item class then display all the items under that class in another deck level.
2. i want user to be able to select any customer class then display all the customer accounts under that class in another deck level.

Any suggestion on how to control what level deck to display or how to make the requirements possible?

Thank you in advance.