If you had a page with two graphs, let's say a bar graph and a pie chart, could you make the bar graph clickable such that if you clicked on a bar on the bar graph, it would refresh the pie chart to reflect some other set of data? For example, if you had a bar graph showing revenue, you could click on the revenue for a month, and that would reload data for a pie graph that would show the breakdown of the sources of revenue on a pie graph.