UnmarkAllUnits unmarkAllUnits = new UnmarkAllUnits(group,
quadMap.getGameData());
unmarkAllUnits.execute();
MarkUnit markUnit = new MarkUnit(group, units.get(0));
markUnit.execute();
} else {
Messages.getMessages().info("QuadIsoLayUnitView", "QMapWarn",
"When executing mark-only-top-unit: QuadMap has "
+ "no game-data");
}