Michael McCusker has given this talk at several Tableau User Groups and at TC26, and the written version is just as clear. Dynamic Zone Visibility is the feature that shows or hides anything on a dashboard based on what the user clicks, and it takes three steps: create a parameter, create a true/false calculated field that reads it, then tick the box in the Layout pane. He starts with a cheat sheet toggle, answers the obvious question (is this just sheet swap?) and steps up to a container of worksheets, text and images guided one option at a time. Includes the recording of the live demo.