Sometimes there is a desire to select a bar and highlight the bar selected.

In this case, every time a sub category is selected, the corresponding bar turns to a color that distinguishes it from the other bars.

To make this, we will use parameter actions.

First, make a parameter for the sub category.

Next, make a calculated field to make a boolean value:

Then drag the calculated field onto color.

Finally, make a parameter action to change the sub category parameter every time one is selected.

Now every time a bar is clicked, the bar will be highlighted.