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3.7.4 Restoring Default Mouse Handling

As soon as you define #handlesMouseDown: in your Morph subclass, you lose the default behavior where a morph is picked up when clicked on.

To restore this behavior, compile the following two methods in your morph class:

mouseDown: anEvent

anEvent hand waitForClicksOrDrag: self event: anEvent.
startDrag: anEvent

anEvent hand grabMorph: self.

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