DS 1.6 - Crosstab questions

Hello!  I am new with Design Studio and using Version 16 SP1 Patch 1.

I have a crosstab which I would like to drill on.  I can do this with a chart, but can't get it to work here.

The crosstab is connected to a UNX data source and displays 5 columns of that data source.

I want to click on a row (anywhere in the row), and display a pop up container which contains additional information from the data source, namely Summary text data.  The Summary text data is not displayed in the crosstab, but is in the query for the UNX data source.

I know how to make the popup visible when I click on the row.

I've tried filtering using an ID field and then using CROSSTAB_1.getSelectedMember"_xxxxxx").text;

I cannot make this work.

Does anyone have any ideas?

Thanks!