add tabular data to matrix report

Hi my data set from a SSAS source consists of the following fields

Matter_Number, Fee_Earner, Date, Description, Count

I've created a matrix report with 2 row groups of Matter_number and Fee_Earner

I then have the following columns next to Matter_number and Fee Earner

Min(date),Max(Date),Sum(Count)

What I would like to do is that the user can toggle on the Sum(count) column to reveal the granular detail of the dates and description per Matter Number and Fee Earner.

Is this possible?

Regards