Index: src/org/openstreetmap/josm/data/osm/OsmPrimitive.java
===================================================================
--- src/org/openstreetmap/josm/data/osm/OsmPrimitive.java	(revision 219)
+++ src/org/openstreetmap/josm/data/osm/OsmPrimitive.java	(revision 220)
@@ -54,4 +54,11 @@
 	 */
 	public boolean deleted = false;
+
+	/**
+	 * <code>true</code>, if the object has been shown. This property is not used
+	 * internally by JOSM, but can be used by plugins that take over the object
+	 * rendering.
+	 */
+	public volatile boolean shown = false;
 
 	/**