Will this work for XamGrid ?  I tried but it does not work.

<

UserControl.Resources>

<Style x:Key="DiggPanelDetail" TargetType="TextBox">

<Setter Property="Background">

<Setter.Value>

<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">

<GradientStop Color="#FFFFF098"/>

<GradientStop Color="#FFFFF9D4" Offset="1"/>

</LinearGradientBrush>

</Setter.Value>

</Setter>

  </Style>

  <Style x:Key="RowStyle" TargetType="ig:ConditionalFormattingCellControl" >

 <Setter Property="FontWeight" Value="Bold" />

  <Setter Property="Background" Value="Gold" />

  <Setter Property="AltBackground" Value="Gold" />

  </Style>

<Style TargetType="TextBox" x:Key="st">

<Setter Property="MaxLength" Value="21"/>

</Style>

</UserControl.Resources>

.....

<ig:TextColumn Key="Serlnmbr" EditorStyle="{StaticResource st}" >

<ig:TextColumn.HeaderTemplate>

<DataTemplate>

<TextBlock Text="SerialNumber"   />

</DataTemplate>

</ig:TextColumn.HeaderTemplate>

</ig:TextColumn>