Windows in the pager are decorated accordingly to MyStyle definitions
If you never defined those MyStyles, Pager will default to same styles as used for actual windows.
The Pager can be used to change the viewport in the current desktop or to change desktops (left mouse button), or to move windows around (middle mouse button).
To change look of selected page use any of the paramaters listed: PagerDecorations NoPageSeparator, NoSelection, SelectionColor, GridColor, DeskBorderWidth, DeskBorderColor
AfterStep Documentation - October 2005 ( 80% complete )