The original poster did not select an answer. I'm going to combine the previous two into one super answr !: P
You can enable word wrap in all columns in a Spark DataGrid with the rowHeight variable:
<s:DataGrid variableRowHeight="true">
</s:DataGrid>
Or you can enable word wrap in a separate column using the wrap wrap property in the default GridColumn renderer:
<s:GridColumn dataField="fields.description" headerText="Description" >
<s:itemRenderer>
<fx:Component>
<s:DefaultGridItemRenderer wordWrap="true"/>
</fx:Component>
</s:itemRenderer>
</s:GridColumn>
Also, in the Grid Column example, I recommend setting the width if you want to prevent horizontal scrollbars:
<s:GridColumn width="{dataGrid.width-column1.width-column3.width}" dataField="fields.description" headerText="Description" >
<s:itemRenderer>
<fx:Component>
<s:DefaultGridItemRenderer wordWrap="true"/>
</fx:Component>
</s:itemRenderer>
</s:GridColumn>
, true , , .