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As discussed in the last chapter, a chart is a great way to give a high-level overview of your data. But users, curious types that they are, may be enticed by those high level charts to learn more about the underlying detail data.
Wouldn't it be great if a user could simply click on one of the sections of the chart to bring up a detailed report for the data represented by that section? Wouldn't you know it? APEX makes this easy to do.