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    <p>Lets say you have a property <code>count</code> in some class. Easiest way is to generate setter and getter for this property and inside the setter to dispatch some custom event. </p> <pre><code>protected var _count:Number; public function get count():Number { return _count; } public function set count(value:Number):void { _count = value; dispatchEvent(new CountEvent(CountEvent.COUNT_CHANGED, value, true)); } </code></pre> <p>This is the custom event class:</p> <pre><code>public class CountEvent extends Event { public static const COUNT_CHANGED:String = "countChanged"; public var data:Object; public function CountEvent(type:String, data:Object, bubbles:Boolean=false, cancelable:Boolean=false) { super(type, bubbles, cancelable); this.data = data; } override public function clone():Event { return new CountEvent(type, data, bubbles, cancelable); } } </code></pre> <p>Note that if you need the value of the property and don't have reference to the object itself, you can create a data-object event. In order for this kind of custom event to work properly you need to override the clone method, which is used every time the event is re-dispatched.</p> <p>If you are looking for more advanced way of "observing" something is by using some custom code, e.g. <a href="http://code.google.com/p/flit/source/browse/trunk/flit/src/obecto/utility/observe/Observe.as?r=190" rel="nofollow">http://code.google.com/p/flit/source/browse/trunk/flit/src/obecto/utility/observe/Observe.as?r=190</a></p> <p>In either way you must decide whether you want to modify your class by adding a dispatcher (if your class is not a <strong>EventDispatcher</strong> subclass) and dispatch an event or use some other techniques. Another way is to make the property <code>[Bindable]</code> and use a binding between your property and some function to watch if something changes.</p>
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    1. POI want the stage to react every time some changes are made to certain objects. Is there a way to write custom Event?
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    1. USVladimir Tsvetkov
    1. USIvan Raykov
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    1. COso i need to modify the class i want to listen to?
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    2. COcan you be a little more specific about your last sentences?
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    3. COIn order to dispatch event from the class you need to watch, this class must extends EventDispatcher or have a reference to an object that extends it so it can dispatch the event. About the binding stuff i mentioned - you can use the Flex framework BindingUtils class http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/mx/binding/utils/BindingUtils.html in order to watch when something happens to your property.
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      1. USIvan Raykov
 

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