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Flash Player 6.
someListener.onSetFocus = function(oldFocus,newFocus){statements; }
Listener; notified when the input focus changes. To use onSetFocus, you must create a listener object. You can then define a function for onSetFocus and use addListener() to register the listener with the Selection object, as in the following:
someListener = new Object();
someListener.onSetFocus = function () { ... };
Selection.addListener(someListener);
Listeners enable different pieces of code to cooperate because multiple listeners can receive notification about a single event.
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