Answer Posted / Mayank Gupta

An ItemRenderer is a custom component that defines the appearance and behavior of an individual data item within a List-based control, such as a List or DataGrid. To create an ItemRenderer for use at runtime in Flex, you need to extend the UIComponent class and then assign it to the itemRenderer property of your List or DataGrid. Here's a simple example:

```actionscript
import mx.controls.listClasses.ItemRenderer;

public class MyItemRenderer extends ItemRenderer {
private var myData:Object;

public function MyItemRenderer() {
super();
}

override protected function updateDisplayList(unscaledWidth:Number, unscaledHeight:Number):void {
// Customize the appearance and behavior of your item here
}

public function set data(value:Object):void {
myData = value;
refresh();
}
}

// In your MXML file:
<mx:List id="myList" itemRenderer="MyItemRenderer">
// Other List properties and child components
</mx:List>
```
In this example, a custom ItemRenderer called 'MyItemRenderer' is created to render items in a List. You can assign it to the itemRenderer property of your List or DataGrid.

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