Your HorizontalPanel was not added to a parent widget, so
Widget.onAttach() was not called. This is where event handlers are
setup.
You could hack your panel to call Widget.onAttach(), but there's
probably a cleaner ways to do this. Can't you use RootPanel.get
("parentId").add(panel)
to add your panel to the DOM tree? Then onAttach() is called
automatically.
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