<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/02/08/displaying-tool-tips-in-a-flex-datagrid-controls-header/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white" viewSourceURL="srcview/index.html">

    <mx:XML id="xmlDP">
        <nodes>
            <node col1="One.1" col2="One.2" />
            <node col1="Two.1" col2="Two.2" />
            <node col1="Three.1" col2="Three.2" />
            <node col1="Four.1" col2="Four.2" />
            <node col1="Five.1" col2="Five.2" />
            <node col1="Six.1" col2="Six.2" />
            <node col1="Seven.1" col2="Seven.2" />
            <node col1="Eight.1" col2="Eight.2" />
            <node col1="Nine.1" col2="Nine.2" />
        </nodes>
    </mx:XML>

    <mx:DataGrid id="dataGrid"
            dataProvider="{xmlDP.node}"
            width="300"
            height="200">
        <mx:columns>
            <mx:DataGridColumn dataField="@col1"
                    headerText="The quick brown fox jumped over the lazy dog"
                    headerRenderer="mx.controls.Label" />
            <mx:DataGridColumn dataField="@col2"
                    headerText="Lorem ipsum dolor sit amet, consectetuer adipiscing elit"
                    headerRenderer="mx.controls.Label" />
        </mx:columns>
    </mx:DataGrid>

</mx:Application>