In Morph>>#handleMouseDown:, it sets the wasHandled: flag of the incoming Event to true.
Isn't it more appropriate for wasHandled: to be set by the code that actually _handles_ the event? i.e., in #mouseDown:?
In my overridden mouseDown:, I have several code paths that may or may not choose to handle the event. The logical approach seemed to be for each to simply checked #wasHandled and, if not, decide whether it wants to handle it and, if so, set wasHandled: true, so none of the subsequent possibilities will attempt to handle it.