Pieces that have the 'Mark When Moved' trait will automatically display a specifiable image every time they are moved. Specify the image and the position at which to draw the image. The board command.moved status of an individual piece can be toggled with a key.
NOTE: In order to enable this feature, you must also go to the Global Options of the module and enable the "Mark pieces that move" setting. Enabling this feature will automatically add a button to each Map Window that clears the moved status of all pieces on the map.
This trait sets the Property Moved='true when the piece has been moved.