Working through examples, I don't see a MyBorder class in Navomatic Example

Question

Working through examples, I don't see a MyBorder class in the "Navomatic" Example. Without this class the example doesn't work, and I don't see (or may have missed) an explanation of what it is, and something indicating where it's defined. The import line below import org.apache.wicket.examples.compref.MyBorder; generates a "cannot be resolved" error.

I'm open to suggestions as to how to proceed.

I was expecting this class to either be defined within the example, or for the import to work which references it. Neither appears to be the case.

Answer 1

The examples' sources could be found here. In a browser just type t to search and enter the name of the class/file in the search box.

And MyBorder is here