How to get “Show Desktop” button to my Fedora 10 (KDE4) Panel
In Category KDE
You can simply press Ctrl+F12 to get what you expect from “Show Desktop” button on KDE panel. Pressing the same combination of keys will toggle the previous action.
However this article shows you how to add “Show Desktop” button to the KDE panel.
First right click on the panel to get the context menu as shown below. Press “Add Widgets…” menu item in that.
You will get the “Add Widgets” window as shown below.Look for “Show Desktop” entry in the list and drag that item on to your KDE Panel.
If you have done everything right, you should see a new button in your KDE panel as shown in the below diagram.



this is exactly the post I needed to see!