Hello, I use the group functions as follows ..

<GroupByRowStyleDefault BackColor="Control" BorderColor="Window">
                 </ GroupByRowStyleDefault>
                 <GroupByBox>
                     <BoxStyle BackColor="ActiveBorder" BorderColor="Window">
                     </ BoxStyle>
                 </ GroupByBox>
                 <AddNewBox Hidden="False">
                     <BoxStyle BackColor="Window" BorderColor="InactiveCaption" BorderWidth="1px" BorderStyle="Solid">
                         <BorderDetails ColorLeft="White" ColorTop="White" WidthLeft="1px" WidthTop="1px">
                         </ BorderDetails>
                     </ BoxStyle>
                 </ AddNewBox>
                 <ActivationObject BorderColor="" BorderWidth="">
                 </ ActivationObject>
                 <FilterOptionsDefault>
                     <FilterDropDownStyle CustomRules = "overflow: auto;" BackColor = "White" BorderColor = "Silver"
                         BorderWidth = "1px" BorderStyle = "Solid" Font-Names = "Verdana, Arial, Helvetica, sans-serif"
                         Font-Size = "11px" Height = "300px" Width = "200px">
                         <Padding Left="2px"> </ Padding>
                     </ FilterDropDownStyle>
                     <FilterHighlightRowStyle BackColor="#151C55" ForeColor="White">
                     </ FilterHighlightRowStyle>
                     <FilterOperandDropDownStyle CustomRules = "overflow: auto;" BackColor = "White" BorderColor = "Silver"
                         BorderWidth = "1px" BorderStyle = "Solid" Font-Names = "Verdana, Arial, Helvetica, sans-serif"
                         Font-Size = "11px">
                         <Padding Left="2px"> </ Padding>
                     </ FilterOperandDropDownStyle>
                 </ FilterOptionsDefault>

But when I drag the header field to do group ,
and click the plus sign to open the details,
then to scroll mouse,
and there will be error into the debugger mode,
In this line "parentNodeStyle.width = hdrTblWidth;"
there is an invalid argument error,
would you tell me, how to solve ?