[flexcoders] How do I declare a DataGridHeader for a datagrid?

[steve]

How do I declare a DataGridHeader for a datagrid?
I'd like to create a datagridHeader for the first column, 
how do I set it or declare it?


<mx:Script>
        <![CDATA[
        import mx.controls.dataGridClasses.DataGridHeader;

        var firstColumn:DataGridColumn = myGrid.columns[0];
// var firstDataGridHeader:DataGridHeader = ??? ;

        ]]>
        </mx:Script>

<mx:DataGrid id="myGrid">
    <mx:dataProvider>
        <mx:Object Artist="Pavement" Price="11.99"
          Album="Slanted and Enchanted"/>
        <mx:Object Artist="Pavement"
          Album="Brighten the Corners" Price="11.99"/>
    </mx:dataProvider>
    <mx:columns>
        <mx:DataGridColumn dataField="Album"/>
        <mx:DataGridColumn dataField="Price"/>
    </mx:columns>
  </mx:DataGrid>