This however is kind of wrong : set('xy_1', [this, 1])
(the variable this is null here, usually in js it represents the execution context, but scripts are executed in a detached context in OSC. The use of "this" in the @{} syntax and in some scripting functions as a shortcut to "this widget's id" may be misleading, it's just a sementical convenience, not an actual object reference)