Hello Imraan
THe PieChart has a property called Clickable. Set it to True and set the OnClick screen action.
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In the screen action, you can use the action DataPoint_GetClicked (from the Charts extension). It returns a value, of type DataPoint structure, with the information of the datapoint you clicked, that you can use to know the category and than change the value of the filter, reexecute the aggregate and refresh the UI.
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Hope this helps.
Cheers,
Eduardo Jauch