Hi David Ocasio,
As I understand you want when you select a series all other series to fade out. And when you have for example only one selected data series and you unselect it, all data series to appear as selected (with no opacity).
This is possible but please keep in mind that your requirement leads to unexpected behavior. That is because you can customize the selected state to look as the hover state, but our control is not designed to work in such way - when you unselect selected series, the expected behavior is to have it unselected, not to select all other data series.
Please let me know which type of chart you use in your project and I will send you a sample solution so you can have an overview of the possible approach.
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