visad examples -- compile errors

what is the trick for compiling the VisAd examples?
we get errors such as:

1) can not instantiate an abstract class Test67 (class UISkeleton)
2) call "void collabSourceLost" is not defined

we'd like to compile the examples and use WebStart to
download them, but can't quite figure out the appropriate
"superstructure" .   any suggetions?

thanks.
--

jim schmidt
703-925-3141(v)  703-925-3246(f)