 
     @listenTo(@model.flycam3d, "changed", @render)
     @listenTo(@model.flycam, "zoomStepChanged", @render)
+    @listenTo(@model.skeletonTracing, "deleteTree", @render)
+    @listenTo(@model.skeletonTracing, "mergeTree", @render)
+    @listenTo(@model.skeletonTracing, "newTree", @render)
 
 
   serializeData : ->


    @model.flycam3d.off("changed")
    @model.flycam.off("zoomStepChanged")


    return {
      annotationType : @model.get("tracingType")
      zoomLevel : @calculateZoomLevel()
      dataSetName : @model.get("dataset").get("name")
      treeCount : @model.skeletonTracing.trees.length
    }


