Made the InterfaceManager reference static and the related getter as well.

TULIP/src/lu/list/itis/dkd/tui/TangibleApplication.java

@@ -62,7 +62,7 @@ public abstract class TangibleApplication {
      * An implementation of the {@link JComponent} handling all interactions with the visual
      * interface as well as its construction.
      */
-    private TangibleInterfaceManager interfaceManager;
+    private static TangibleInterfaceManager interfaceManager;
 
     /**
      * An instance of the {@link TangibleObjectManager} to handle all interactions with tangible
@@ -185,7 +185,7 @@ public abstract class TangibleApplication {
      * 
      * @return The value of interfaceManager.
      */
-    public TangibleInterfaceManager getInterfaceManager() {
+    public static TangibleInterfaceManager getInterfaceManager() {
         return interfaceManager;
     }