Issue #3: Start/Stop tracking is now possible in the Navigation Step
Issue #6: A button was added to save the scene
Issue #4: A button was added in the Navigation Step to reset the camera. It is still no clear what is the best way to reset the camera. See Issue #4 for details
Issue #1: Resize of the button works fine. The problem arise when a description is set in the step, therefore descriptions were removed. See details in Issue#1
Also were substituted all the lines that use: slicer.app.* because it does not work fine when running the application as a Slicelet.