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    <p>I think it might be better for studyId to refer to the dataGrid rather than the dataGrid referring to studyId. You can add this to your main mxml:</p> <pre><code>&lt;mx:TextArea id="studyId" text="{dataGrid.selectedItem.Study}"/&gt; </code></pre> <p>This should work because TextArea.text will respond to the property changed event of DataGrid.selectedItem, so it will change whenever the selection changes.</p> <p>EDIT: Dispatching events:</p> <p>You can dispatch an event from any place in your code, and listeners will be able to listen in to that event. Eg:</p> <pre><code>&lt;mypackage:MyComponent&gt; ... private function foo():void { dispatchEvent(new MouseEvent(MouseEvent.CLICK)); // Dispatches a mouse event whenever foo is called. } </code></pre> <p>Now you can listen for that event:</p> <pre><code>&lt;mypackage:MyComponent id="myComponent"/&gt; ... myComponent.addEventListener(MouseEvent.CLICK, mouseClickHandler); private function mouseClickHandler(event:MouseEvent):void { ... // code to handle that event here. } </code></pre> <p>Hope this helps!</p> <pre><code>&lt;mx:MainComponent creationComplete="init()" ...&gt; ... private function init(event:Event):void { ... customComponent.addEventListener(StudyEvent.STUDYSELECTED, studySelectedListener); ... } private function studySelectedListener(event:StudyEvent):void { studyid.text = event.study.studyId; // or wherever you store your studyId value ... } ... &lt;mx:MainComponent/&gt; </code></pre> <p>What happens is whenever a StudyEvent.STUDYSELECTED event is fired from your customComponent, it will be caught by your main function and studySelectedListener will be called.</p>
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    1. COhey...Thanks for the suggestion....But, what about the 'Study' being an object which consists of "StudyId, name and userId". I have to show only studyId. Also, is my ItemClick event correct ?? i.e. if I make the change in my main mxml file and keep the itemclick event as it is, will the code work ??
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    2. COIf your object has StudyId and UserId as members, then you can replace selectedItem.Study with selectedItem.StudyId, since the selectedItem will refer to your object(Study). Your itemClickHandler is correct, except you don't have access to the textArea. What you could do if you wanted to stick with your event handler, is to dispatch an event from your itemClickHandler. Your main should catch that event and respond by setting the textArea. This is similar to what I have suggested, the handlers are just hidden by using bindable properties.
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    3. COAnother option is to extend DataGrid with a subclass that takes your main class as a property. Then it can have access to all the components contained in main.
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