I am trying to change the color of a cell to Yellow if the value has been updated in the DataGrid.

My XAML:

<toolkit:DataGrid x:Name="TheGrid"
                              ItemsSource="{Binding}"
                              IsReadOnly="False"
                              CanUserAddRows="False"
                              CanUserResizeRows="False"
                              AutoGenerateColumns="False"
                              CanUserSortColumns="False"                             
                              SelectionUnit="CellOrRowHeader" 
                              EnableColumnVirtualization="True" 
                              VerticalScrollBarVisibility="Auto"
                              HorizontalScrollBarVisibility="Auto">
                <toolkit:DataGrid.CellStyle>
                    <Style TargetType="{x:Type toolkit:DataGridCell}">
                        <Style.Triggers>
                            <DataTrigger Binding="{Binding IsDirty}" Value="True">
                                <Setter Property="Background" Value="Yellow"/>
                            </DataTrigger>
                        </Style.Triggers>
                    </Style>
                </toolkit:DataGrid.CellStyle>
            </toolkit:DataGrid>

The grid is bound to a List of arrays (displaying a table of values kind of like excel would). Each value in the array is a custom object that contains an IsDirty dependency property. The IsDirty property gets set when the value is changed.

When i run this:

• change a value in column 1 = whole row goes yellow
• change a value in any other column = nothing happens

I want only the changed cell to go yellow no matter what column its in. Do you see anything wrong with my XAML?