From MythTV

The appear-ui.xml file governs the layout and behavior of the Screen Size Adjustment Wizard. It consists of the following windows and named attributes:

Screen Wizard Windows

Window Name	Type	Description
appearance	Window	The main screen wizard screen.

The "appearance" window

Widget Name	Widget Type	Description	Required?
topleft	imagetype	The movable top left arrow.	Yes
bottomright	imagetype	The movable bottom right arrow.	Yes
size	textarea	The ending resolution value for the adjusted screen size.	Yes
offsets	textarea	The offset coordinate value of the current arrow's position.	Yes
changeamount	textarea	The number of pixels to move per keypress.	Yes