Answer a DirectedMessage that is sent when the receiver is clicked,
or nil if none has been set up.
callback: aReceiver message: aSymbol
Set up so that aReceiver is sent the aSymbol message (the name of
a zero- or one-argument selector) when the receiver is clicked.
If the method accepts an argument, the receiver is passed.
invokeCallback
Generate a synthetic callback
pressed
This is the default callback for the widget; it does
nothing if you don't override it. Of course if a subclass
overriddes this you (user of the class) might desire to
call this method from your own callback.
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on July, 23 2009
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