How to make the cell's background color red and font bold of the GridViewDataColumn.AggregateFunctions?

[ABC]

when I use the bold AggregateFunctions at the bottom of the column in gridview ,how to change the average,max,min cell background color and its font?
I seems that it has no property called "BackGround"?
 <telerik:GridViewDataColumn Width="*" Header="Math"   DataMemberBinding="{Binding MathValue}"   >
                                                        <telerik:GridViewDataColumn.AggregateFunctions>
                                                            <telerik:AverageFunction  />
                                                            <telerik:MaxFunction  />
                                                            <telerik:MinFunction  />
                                                        </telerik:GridViewDataColumn.AggregateFunctions>
                                                    </telerik:GridViewDataColumn>