This is tricky to implement, as it requires some hackery to work. 
 Basically, if I understand the nature of what you want, you need to group 
the data after it is filtered, and draw the chart based on the grouped 
data.  Here's a hack that I wrote to tackle this, applied to your code: 
http://jsfiddle.net/asgallant/tCVGM/

On Monday, November 12, 2012 1:11:19 PM UTC-5, Tim Bowker wrote:
>
> Hi,
>
> I've been playing around with the dashboard capabilities and I am 
> struggling with the correct way to do something I believe should be very 
> simple...
> In brief I would like the functionality of a CategoryFilter but rather 
> than filtering the data I would like it to re-summarise the data.
> For example, I have sales for two markets (A,B) across a 3 week period:
>
> Market, Week, Sales
> A, 1, 10
> A, 2, 11
> A, 3, 12
> B, 1, 5
> B, 2, 4
> B, 3, 3
>
> In the unfiltered state I want to get the sum of sales across both markets:
> Week, Sales
> 1, 15
> 2, 15
> 3, 15
>
> When I filter market A or B I want to get back to the individual series 
> correctly.
>
> How do I do this?
> I've attached where I've got to - the problem being that in the unfiltered 
> state I get 2 series plotted on the chart rather than the sum total.
>
> Additional notes:
> 1. In the final version I will have more than one filtering column (e.g. 
> Market, Country, State etc.).
> 2. In the final version I will be reading from a Google spreadsheet so if 
> I need to use the data query functionality that will be fine.
>
> Thanks in advance,
> Tim
>
>

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