Bugfix in GraphElementPropertyBasedComparator

src/de/tudarmstadt/maki/simonstrator/api/common/graph/GraphElementPropertyBasedComparator.java

 /*
- * Copyright (c) 2005-2010 KOM  Multimedia Communications Lab
+ * Copyright (c) 2005-2010 KOM � Multimedia Communications Lab
  *
  * This file is part of Simonstrator.KOM.
  * 
@@ -43,7 +43,7 @@ public class GraphElementPropertyBasedComparator implements Comparator<IElement>
 			throw new IllegalArgumentException(
 					String.format("Element %s does not have required property %s", o2, graphElementProperty));
 
-		return p1.doubleValue() == p2.doubleValue() ? 0 : p1.doubleValue() < p2.doubleValue() ? -1 : 0;
+		return p1.doubleValue() == p2.doubleValue() ? 0 : (p1.doubleValue() < p2.doubleValue() ? -1 : 1);
 	}
 
 }