This question came up in the discussion forum. You can also follow the steps described in this Design Studio tutorial http://scn.sap.com/docs/DOC-33569
It is easy to do and has some nice interactive features for consumers of your Design Studio application.
First, I added a crosstab to my application
From the Analytic Components area, select Filter Panel and drag over to the canvas.
Then assign the data source to the component
Then Execute Locally:
This is how it looks at run time. Simply select the desired field to filter:
I am only selecting a handful of projects to filter on:
Review the results: