only filter on one chart at a time
only filter on one chart at a time

mtraynham/dc.js,aaronhoffman/dc.js,aaronhoffman/dc.js,mtraynham/dc.js,mtraynham/dc.js,dc-js/dc.js,TheDataShed/dc.js,mtraynham/dc.js,TheDataShed/dc.js,TheDataShed/dc.js,TheDataShed/dc.js,aaronhoffman/dc.js,dc-js/dc.js,aaronhoffman/dc.js,aaronhoffman/dc.js,TheDataShed/dc.js,dc-js/dc.js,dc-js/dc.js,dc-js/dc.js,mtraynham/dc.js