Just saw on Haikuware that there is another GUI for setting a decorator. First, I’m happy that people are actually using this “hidden” functionality to write custom applications. However, after Alpha 3 I changed the decorator API which broke all other decorators.
This is a companion discussion topic for the original entry at https://www.haiku-os.org/blog/czeidler/2012-05-21_decorators_and_stack_and_tile/