need to know the name of Add on which implement navigator listAsin sampler

General
1

i want to implement a list of navigation button or history list of pages you have traversed like implemented in above pic. Please tell me name of this plug in or method.

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3

i dont know why image is not appearing.O.k i want an add on or method to implement just as in vaadin sampler right to sampler logo a horizontal list of traversed pages.

4

You can find the source code of the Sampler application
here
.

I cannot recall if the Sampler application is using some add-on for this or just handling it directly in the application.