<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/09/16/aligning-the-header-text-in-a-datagrid-column-in-flex/ -->
<mx:Application name="DataGrid_headerStyleName_textAlign_test"
        xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white">

    <mx:Style>
        DataGrid {
            headerStyleName: centerBold;
        }

        .centerBold {
            fontWeight: bold;
            textAlign: center;
        }
    </mx:Style>

    <mx:XML id="dp" source="data/products.xml" />

    <mx:DataGrid id="dataGrid"
            dataProvider="{dp.product}"
            rowCount="5"
            verticalScrollPolicy="on"
            width="300">
        <mx:columns>
            <mx:DataGridColumn id="dataGridColumn1"
                    dataField="@name"
                    headerText="This is a column with a long title:"
                    headerWordWrap="true"
                    minWidth="80" />
            <mx:DataGridColumn id="dataGridColumn2"
                    dataField="@price"
                    headerText="Price:"
                    headerWordWrap="false"
                    minWidth="20" />
        </mx:columns>
    </mx:DataGrid>

</mx:Application>