gwt-earth - adding controls to the plugin?

Does anyone know if it is possible to add controls to the Google Earth
plugin?
For a simple example, I'd like to create a GWT PushButton and add it
to the window.

For the 2D Google Maps, there is a method MapWidget.addControl(), but
I don't see anything
similar with the Google Earth plugin. And most examples seem to place
the controls on a separate panel.

Thanks,
Jason

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