I&#39;m trying to create a GUI in TraitsUI that includes two Mayavi figures. I have implemented these figures as per the [multiple engines example][1] in the Mayavi documentation.

However, when I add a colorbar to one of the figures and run the GUI script it sometimes opens a blank Mayavi Scene Editor window in addition to the desired TraitsUI window. This blank window doesn&#39;t always appear, never on the first run after restarting the python kernel, and sometimes only after running the script a few times in succession and closing the windows that appear each time.

Running the much-reduced code below produces the same behaviour, and removing the `mlab.colorbar(s)` line stops the problem. How can I get a colorbar without opening blank windows? There doesn&#39;t seem to be an obvious way to assign a colorbar to a specific figure as for the surface plot. I am running Python 3.5 on Windows 7 (but get the same issues on Ubuntu).

    from traits.api import HasTraits, Instance, on_trait_change
    from traitsui.api import View, Item
    import numpy as np
    
    from mayavi.core.api import Engine
    from mayavi.core.ui.api import SceneEditor, MlabSceneModel
    from mayavi import mlab
    
    #Generate a test surface to display
    def test_surf():
        x, y = np.mgrid[-7.:7.05:0.1, -5.:5.05:0.05]
        z = np.sin(x + y) + np.sin(2 * x - y) + np.cos(3 * x + 4 * y)
        return x, y, z        
        
    class MyApp(HasTraits):
        
        #Create a mayavi scene with a specified engine
        engine = Instance(Engine, ())
        scene = Instance(MlabSceneModel)
        def _scene_default(self):
            self.engine.start()
            return MlabSceneModel(engine=self.engine)         
        
        #Plot the surface when the scene is activated
        @on_trait_change(&#39;scene.activated&#39;)
        def populate_scene(self):
            s = mlab.surf(*test_surf(), figure=self.scene.mayavi_scene)
            mlab.colorbar(s)
    
        view = View(Item(&#39;scene&#39;, editor=SceneEditor()))
    
    if __name__ == &#39;__main__&#39;:
        MyApp().configure_traits()

  [1]: http://docs.enthought.com/mayavi/mayavi/auto/example_multiple_engines.html

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Mayavi colorbar in TraitsUI creating blank window