Read other parts:Part 1 - BasicsPart 2 - Composition & Graphics
Part 3 - Creating Panel SwitchersPart 4 - Avoiding Truncated PanelsPart 5 - Elements Relative Position and Size
Creating Panel Switchers
A lot of awesome foobar2000 skins here in DA will let you switch between multiple panels. It means you can put many panels in the same place, on top of each other, and then assign a set of buttons to trigger which panel should be shown, whilst the rest of it remains hidden.
Lux by Markkoenig and my Jam would be a perfect examples. As you can see on the screenshot below, Lux and Jam use set of buttons to show the selected panel. By the way