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1.12.2 BLOX.BDropDown: callbacks

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.

Generate a synthetic callback