I am trying to apply conditional formatting on a column in a XamGrid. I want the font to be red if the value is negative.

  <Style x:Key="RedFontStyle" TargetType="ig:CellControl">
            <Setter Property="Foreground" Value="DarkRed"/>
        </Style>

  <ig:TextColumn.ConditionalFormatCollection>
                <ig:LessThanConditionalFormatRule Value="0.00" StyleToApply="{StaticResource RedFontStyle}" />
            </ig:TextColumn.ConditionalFormatCollection>

The LessThanConditionalFormatRule element has "Value cannot be null. Paramenter name key." What am I doing wrong?

Thanks!