> someObject perform: ('foo' , 'Bar') asSymbol. "There are no senders of
> #fooBar! Oh wait..."

(SimpleButtonMorph new
	label: 'Test';
	target: (MessageSend receiver: World selector: #fooBar);
	actionSelector: #value) openInHand

... no senders of #fooBar are found either.

Of course the above example is silly, but my point is that the look-up 
for senders is not comprehensive anyway.

Stef