title: Color DataGridCell by Cellvalue
body: <p>i've a WPF DataGrid with different count of columns. I want to color the single cells dependent by the value.
  For example: If the cell-value is 0, then red.</p>
  
  <p>These are my experiments:</p>
  
  <pre><code>&lt;DataGrid Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="2" x:Name="DataGrid"  SelectionUnit="Cell"&gt;
          &lt;DataGrid.CellStyle&gt;
              &lt;Style TargetType="{x:Type DataGridCell}"&gt;
                  &lt;Style.Triggers&gt;
                    &lt;!--experiment 1 --&gt;
                      &lt;DataTrigger Binding="{Binding RelativeSource={RelativeSource Self}, Path=Value, NotifyOnSourceUpdated=True, NotifyOnTargetUpdated=True}" Value="0"&gt;
                          &lt;Setter Property="Background" Value="LimeGreen"/&gt;
                      &lt;/DataTrigger&gt;
                     &lt;!--experiment 2 --&gt;
                      &lt;DataTrigger Binding="{Binding RelativeSource={RelativeSource Self}, Path=Content, NotifyOnSourceUpdated=True, NotifyOnTargetUpdated=True}" Value="0"&gt;
                          &lt;Setter Property="Background" Value="LimeGreen"/&gt;
                      &lt;/DataTrigger&gt;
                      &lt;/Style.Triggers&gt;
              &lt;/Style&gt;
          &lt;/DataGrid.CellStyle&gt;
  &lt;/DataGrid&gt;
  </code></pre>