StyleSelector for setting GridViewCell Background color and border color

[Lior]

Hi,
we've implemented a styleSelector for style switching. but cell backgroupd color and border could not be set 
Style:

<Style x:Key="CellLv1Validation"   TargetType="telerik:GridViewCell">
       <Setter Property="BorderBrush" Value="Red"/>
       <Setter Property="BorderThickness" Value="1" />
       <Setter Property="Background" Value="Yellow"/>
   </Style>

StyleSelector:

  public override Style SelectStyle(object item, DependencyObject container)
 {
            Style style = null;
             Uri uri = new Uri("/Solution.Common;component/Assets/ApplicationStyles.xaml", UriKind.RelativeOrAbsolute);
                    ResourceDictionary converterDictionary = new ResourceDictionary()
                    {
                        Source = uri
                    };

              style = converterDictionary["CellLv1Validation"] as Style;
            DataRow dr = item as DataRow ;
            return dr.isNeedStyle ? style : null
}

Another StyleSetter from telerik. but this style is only having border and background color, the text in girdcellview disappear.

<Style x:Key="CellLv1Validation2" TargetType="telerik:GridViewCell" >
            <Setter Property="Background" Value="Red"/>
              <Setter Property="Template">
           <Setter.Value>
            <ControlTemplate TargetType="telerik:GridViewCell">
                 <Border x:Name="PART_CellBorder" BorderBrush="Red" BorderThickness="1" Background="Yellow"/>
              </ControlTemplate>
           </Setter.Value>
        </Setter>
   </Style>

And I've found a thread to set the Template , but it's complex, What we need is only to set the border color and cell background color,
Any suggestions? thank you in advance.