Dear Koh,
the tool lacks an #updateContents method. Try adding
BrowserPrintHierarchyTool>>updateContents
self text value: codeModel classOrNameSpace printHierarchy.
That seems to work OK for me.
If this, or some development of it, works for you, I assume you will
publish a 7.10 - 1 version to the open repository.
HTH
Niall Ross
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