[DEVEXPRESS/WPF] PivotGridControl 엘리먼트 : 상위 값 N개 표시하기

<dxpg:PivotGridControl x:Name="pivotGridControl">
    <dxpg:PivotGridControl.Fields>
        <dxpg:PivotGridField x:Name="countryPivotGridField"
            FieldName="Country"
            Area="RowArea" />
        <dxpg:PivotGridField x:Name="customerPivotGridField"
            FieldName="Sales Person"
            Area="RowArea"
            SortByField="{Binding ElementName=extendedPricePivotGridField}"
            SortOrder="Descending"
            TopValueCount="3"
            TopValueShowOthers="True"
            Caption="Customer" />
        <dxpg:PivotGridField x:Name="extendedPricePivotGridField"
            FieldName="Extended Price"
            Area="DataArea"
            CellFormat="c0" />
    </dxpg:PivotGridControl.Fields>
</dxpg:PivotGridControl>

※ xmlns:dxpg="http://schemas.devexpress.com/winfx/2008/xaml/pivotgrid"