There are several styles for the Status Index window that you can choose.
There is nothing shown when the window is concealed. The window is invisible with no graphics or controls to minimize the amount of memory used. Nothing will appear on the screen when you attempt to activate the window.
This style Status Index window uses transparent buttons.
This style Status Index window uses circular buttons from Mythic's original UIs.
This style Status Index window uses circular buttons from Mythic's Atlantis UI.
This style Status Index window uses circular buttons from Wiggle's Lotro UI.
This style Status Index window uses circular Sohwyn buttons like those found in other custom UIs.