I've created a short xml-style list in Flex 3, and I'm trying to style it.,
Is it possible in Flex to target particular elements? For example, I would like the first line to be bolder.

How do I go about that?

This is the MXML:
Code:
<?xml version="1.0" encoding="utf-8"?>
	<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
		<mx:Style>
			Application { font-size: 24; }
			.firstname { font-size: 20; }
		</mx:Style>
		<mx:XMLList id="customers" xmlns="">
			<customer >
				<first>Jack</first>
				<last>Herrington</last>
			</customer>
			<customer>
			<first>Lori</first>
				<last>Herrington</last>
			</customer>
			<customer>
				<first>Megan</first>
				<last>Herrington</last>
			</customer>
		</mx:XMLList>
		<mx:VBox styleName="listOne">
			<mx:DataGrid dataProvider="{customers}" editable="true" width="400">
			<mx:columns>
				<mx:DataGridColumn dataField="first" id="firstname" />
				<mx:DataGridColumn dataField="last" />
			</mx:columns>
		</mx:DataGrid>
		</mx:VBox>
	</mx:Application>