SDK : fixed an issue causing "scene graph updated from another thread " error int he scenecomposer when adding an audio node

git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@10729 75d07b2b-3a1a-0410-a2c5-0572b91ccdca

sdk/jme3-scenecomposer/src/com/jme3/gde/scenecomposer/SceneComposerToolController.java

@@ -281,8 +281,15 @@ public class SceneComposerToolController extends SceneToolController {
     }
 
     protected void refreshNonSpatialMarkers() {
-        nonSpatialMarkersNode.detachAllChildren();
-        addMarkers(rootNode.getLookup().lookup(Node.class));
+        SceneApplication.getApplication().enqueue(new Callable<Void>() {
+
+            public Void call() throws Exception {
+                   nonSpatialMarkersNode.detachAllChildren();
+                   addMarkers(rootNode.getLookup().lookup(Node.class));
+                   return null;
+            }
+        });
+        
     }
     
     private void addMarkers(Node parent) {