diff --git a/tools/cooja/config/cooja_default.config b/tools/cooja/config/cooja_default.config
index f8d9ded5d..b28337631 100644
--- a/tools/cooja/config/cooja_default.config
+++ b/tools/cooja/config/cooja_default.config
@@ -3,6 +3,8 @@ org.contikios.cooja.contikimote.interfaces.ContikiRadio.RADIO_TRANSMISSION_RATE_
 org.contikios.cooja.contikimote.ContikiMoteType.MOTE_INTERFACES = org.contikios.cooja.interfaces.Position org.contikios.cooja.interfaces.Battery org.contikios.cooja.contikimote.interfaces.ContikiVib org.contikios.cooja.contikimote.interfaces.ContikiMoteID org.contikios.cooja.contikimote.interfaces.ContikiRS232 org.contikios.cooja.contikimote.interfaces.ContikiBeeper org.contikios.cooja.interfaces.RimeAddress org.contikios.cooja.contikimote.interfaces.ContikiIPAddress org.contikios.cooja.contikimote.interfaces.ContikiRadio org.contikios.cooja.contikimote.interfaces.ContikiButton org.contikios.cooja.contikimote.interfaces.ContikiPIR org.contikios.cooja.contikimote.interfaces.ContikiClock org.contikios.cooja.contikimote.interfaces.ContikiLED org.contikios.cooja.contikimote.interfaces.ContikiCFS org.contikios.cooja.interfaces.Mote2MoteRelations org.contikios.cooja.interfaces.MoteAttributes
 org.contikios.cooja.contikimote.ContikiMoteType.C_SOURCES =
 org.contikios.cooja.Cooja.MOTETYPES = org.contikios.cooja.motes.ImportAppMoteType org.contikios.cooja.motes.DisturberMoteType org.contikios.cooja.contikimote.ContikiMoteType
-org.contikios.cooja.Cooja.PLUGINS = org.contikios.cooja.plugins.Visualizer org.contikios.cooja.plugins.LogListener org.contikios.cooja.plugins.TimeLine org.contikios.cooja.plugins.MoteInformation org.contikios.cooja.plugins.MoteInterfaceViewer org.contikios.cooja.plugins.VariableWatcher org.contikios.cooja.plugins.EventListener org.contikios.cooja.plugins.RadioLogger org.contikios.cooja.plugins.ScriptRunner org.contikios.cooja.plugins.Notes org.contikios.cooja.plugins.BufferListener
+org.contikios.cooja.Cooja.PLUGINS = org.contikios.cooja.plugins.Visualizer org.contikios.cooja.plugins.LogListener org.contikios.cooja.plugins.TimeLine org.contikios.cooja.plugins.MoteInformation org.contikios.cooja.plugins.MoteInterfaceViewer org.contikios.cooja.plugins.VariableWatcher org.contikios.cooja.plugins.EventListener org.contikios.cooja.plugins.RadioLogger org.contikios.cooja.plugins.ScriptRunner org.contikios.cooja.plugins.Notes org.contikios.cooja.plugins.BufferListener org.contikios.cooja.plugins.DGRMConfigurator
 org.contikios.cooja.Cooja.POSITIONERS = org.contikios.cooja.positioners.RandomPositioner org.contikios.cooja.positioners.LinearPositioner org.contikios.cooja.positioners.EllipsePositioner org.contikios.cooja.positioners.ManualPositioner
 org.contikios.cooja.Cooja.RADIOMEDIUMS = org.contikios.cooja.radiomediums.UDGM org.contikios.cooja.radiomediums.UDGMConstantLoss org.contikios.cooja.radiomediums.DirectedGraphMedium org.contikios.cooja.radiomediums.SilentRadioMedium
+org.contikios.cooja.plugins.Visualizer.SKINS = org.contikios.cooja.plugins.skins.DGRMVisualizerSkin
+
diff --git a/tools/cooja/java/org/contikios/cooja/radiomediums/DirectedGraphMedium.java b/tools/cooja/java/org/contikios/cooja/radiomediums/DirectedGraphMedium.java
index 61f31d9d4..c9bac3f0d 100644
--- a/tools/cooja/java/org/contikios/cooja/radiomediums/DirectedGraphMedium.java
+++ b/tools/cooja/java/org/contikios/cooja/radiomediums/DirectedGraphMedium.java
@@ -45,9 +45,7 @@ import org.contikios.cooja.Mote;
 import org.contikios.cooja.RadioConnection;
 import org.contikios.cooja.Simulation;
 import org.contikios.cooja.interfaces.Radio;
-import org.contikios.cooja.plugins.DGRMConfigurator;
 import org.contikios.cooja.plugins.Visualizer;
-import org.contikios.cooja.plugins.skins.DGRMVisualizerSkin;
 
 /**
  * Directed Graph Radio Medium.
@@ -77,7 +75,6 @@ public class DirectedGraphMedium extends AbstractRadioMedium {
   public DirectedGraphMedium() {
     /* Do not initialize radio medium: use only for hash table */
     super(null);
-    Visualizer.registerVisualizerSkin(DGRMVisualizerSkin.class);
   }
 
   public DirectedGraphMedium(Simulation simulation) {
@@ -86,18 +83,10 @@ public class DirectedGraphMedium extends AbstractRadioMedium {
     random = simulation.getRandomGenerator();
 
     requestEdgeAnalysis();
-
-    /* Register plugin and visualizer skin */
-    simulation.getCooja().registerPlugin(DGRMConfigurator.class);
-    Visualizer.registerVisualizerSkin(DGRMVisualizerSkin.class);
   }
 
   public void removed() {
     super.removed();
-
-    /* Unregister plugin and visualizer skin */
-    simulation.getCooja().unregisterPlugin(DGRMConfigurator.class);
-    Visualizer.unregisterVisualizerSkin(DGRMVisualizerSkin.class);
   }
 
   public void addEdge(Edge e) {