The Insert Calculated Column dialog that you learned about in the last chapter can also be opened directly on any visualization property that references data. If you right-click on an axis or color Columns property, for example, you'll see the option Custom Expression…. If you select Custom Expression… a dialog called Custom Expression will open to give you access to the same expression builder you saw in the Calculated Column dialog.

Apart from allowing you to apply a custom expression for a visualization property, the custom expression dialog provides a very important aesthetic tool: the ability to change the display label of the property. For example, let's return to a scatter plot we created in Chapter 2, Visualize This!, where we plotted Sum([Home Runs]) against Sum([Salary)]. Those axis labels, though accurate, might be off-putting or even hard to understand for your audience. It might seem trivial, but changing the y...