Format and align numbers in a Spark DataGrid

TaskParamCrud.mxml

    <s:GridColumn dataField="valueNum" headerText="Default Value" width="100">
        <s:itemRenderer>
            <fx:Component>
                <s:GridItemRenderer>
                    <fx:Declarations>
                        <s:NumberFormatter id="numberFormatter"/>
                    </fx:Declarations>
                    <s:layout>
                        <s:HorizontalLayout horizontalAlign="right" verticalAlign="middle"/>
                    </s:layout>
                    <s:Label text="{numberFormatter.format(data.valueNum)}" />
                </s:GridItemRenderer>
            </fx:Component>
        </s:itemRenderer>
    </s:GridColumn>

This is not the easiest way. Use labelFunction on the GridColumn. See other Gist.