I am getting msg "The DataGridRowHeader was not found"

I am using below code to add and design datagrid. This code is working when i change framework 4.0 but in 3.5 getting error msg. Need help.


 
               RowHeaderWidth="25" HorizontalAlignment="Left" Margin="90,50,0,0" VerticalAlignment="Top"  x:Name="dgvDetails" Width="810" 
                  GridLinesVisibility="None" CanUserAddRows="True" CanUserResizeRows="False"  SelectionMode="Single" FontFamily="Arial" >
               
                   
               

                 
                   
               

               
                   
               

               
                   
               
               
                   
                      Binding="{Binding ORDERNO,  Mode=TwoWay}" Width="*" />
                   
                      Binding="{Binding ARTNO}" Width="*" />
                   
                      Binding="{Binding QTY}" Width="*" />