We add a new category dataset to the chart by clicking on the Add button. The
following window pops up:
We fill out the series, category, and value expressions, and click on the Ok button.
The Label expression text field allows us to customize the labels for the items
(categories) in the chart. In our case, the state abbreviation (the default label) is
appropriate. Therefore, we choose to leave it blank. We are now ready to run the
report (by clicking on Build | Execute report (using active conn.) ) to see our newly