Creating Dynamic Chart Using Selectable Drop Down Lists

Hello,

I would like to create a chart similar to what excel creates for you when you use the pivot chart wizard. Specifically I would like the drop down menus with clickable boxes to select a piece of data and plot it on a graph.

I am familiar with creating drop down lists using data validation, but I am stumped on how I create a selectable drop down list.

Basically I wish I could just add data to the pivot table chart as I want to graph data against pivot table data on the same chart, but I don't think that is possible.

Thanks in advance!