The above method doesn't belong in StringHolder, but I'm not sure
where it _does_ belong. A comment in it refers to PackageBrowser,
which we don't have. We _do_ have a PackagePaneBrowser though, which
would make a good home for the method.

So is the comment just out of date? Have I missed something?

This would sever another link between Kernel-Models and Tools, which I
count as a good thing!

frank