title: Compare two bind element and change cell color
body: <p>please tell me how to make a value1 cell red  if value1 >= value2 and green when value1 &lt; value2</p>
  
  <pre><code>&lt;DataGrid.Columns&gt;
  &lt;DataGridTextColumn Width="20" Header="value1" Binding="{Binding value1}" /&gt;
  &lt;DataGridTextColumn Width="38" Header="value2 " Binding="{Binding value2 }"&gt;
        &lt;DataGridTextColumn.ElementStyle&gt;
               &lt;Style TargetType="{x:Type TextBlock}"&gt;
                    &lt;Style.Triggers&gt;
                        .........................
                        .........................
                        .........................
                    &lt;/Style.Triggers&gt;
               &lt;/Style&gt;
        &lt;/DataGridTextColumn.ElementStyle&gt;
  &lt;/DataGridTextColumn&gt;
  &lt;/DataGrid.Columns&gt;
  </code></pre>