<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/09/14/toggling-word-wrap-on-a-datagrid-column-header-in-flex/ -->
<mx:Application name="DataGridColumn_headerWordWrap_test"
        xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="top"
        backgroundColor="white">

    <mx:Script>
        <![CDATA[
            private function checkBox_change(evt:Event):void {
                dataGridColumn1.headerWordWrap = checkBox.selected;
            }
        ]]>
    </mx:Script>

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

    <mx:ApplicationControlBar dock="true">
        <mx:Form styleName="plain">
            <mx:FormItem label="headerWordWrap:">
                <mx:CheckBox id="checkBox"
                        change="checkBox_change(event);" />
            </mx:FormItem>
            <mx:FormItem label="rowCount:">
                <mx:HSlider id="slider"
                        minimum="2"
                        maximum="10"
                        value="6"
                        snapInterval="1"
                        tickInterval="1"
                        liveDragging="true"
                        showTrackHighlight="true" />
            </mx:FormItem>
        </mx:Form>
    </mx:ApplicationControlBar>

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

</mx:Application>