Filtering out Chart columns from a DataGrid

Many times we use a combination of Grid and Chart to display the same data and we use the
same data provider for both. The problem starts when you want to filter out some data from the
chart (for example) but not filter it out in the grid.
If you use the same data provider and a filter function, the data will be filtered out in both. 
A colleague from work offered a solution to use XML filtering for this task.
I've implemented this idea using an XML based data provider and ActionScript XML filtering 
to filter out data from the chart only.
Take a look at the example below: you can filter out chart columns using the check boxes in 
the grid.
Code can be found here.

4 Matrices graph

 chartOur creative product managers had an idea to produce a graph which enables viewing up to 4 simultaneous matrices. 
Since our web team fled to their lunch break (I guess they saw it coming...), they came to visit me. 
This visit resulted in the following mock-up:

OK, I know Google Analytics are doing a better job, but still - I think the result is rather cool.
Play with it (not all the features are fully working). Let me know what you think...

Sorry, but the source code can not be released right now as it belongs to the company I work for.

If you have any questions, my E-mail is always open...