<source lang = "xml">
<controls:EvalExpression x:Name="FilterExpression"
Context="{Binding}" Expression="FC1"> <controls:EvalExpressionParameter Name="FC1" Value="{Binding ElementName=InputTextboxName, Path=Text, Converter={StaticResource StringFormatConverter}, ConverterParameter='Item.Values["NAME"].ToLower().Contains("{0}".ToLower())==true'}" /> </controls:EvalExpression>
</source>
</tab>