Hello Anis,

Thank you for your feedback. I am glad that you resolved your issue and I believe that other community members may benefit from this as well.

Thanks again.

Its ok I use it like this:

in XamGridFilterBehavior

protected override void OnAttached()
{
base.OnAttached();
Grid.Loaded += Grid_Loaded;
}

protected override void OnDetaching()
{
base.OnDetaching();
Grid.Loaded -= Grid_Loaded;
}

void Grid_Loaded(object sender, RoutedEventArgs e)
{

var typeOfCollection = (Grid.ItemsSource as System.Collections.ICollection).AsQueryable().ElementType;

var nullFilterOperandType = typeof (NullFilterOperand<>);
var notNullFilterOperandType = typeof(NotNullFilterOperand<>);

var nullType = nullFilterOperandType.MakeGenericType(typeOfCollection);
var notNullType = notNullFilterOperandType.MakeGenericType(typeOfCollection);

foreach (var column in Grid.Columns.OfType<CustomTemplateColumn>())
{
Grid.Columns.DataColumns[column.Key].FilterColumnSettings.RowFilterOperands.Add((FilterOperand)Activator.CreateInstance(nullType, column.FilterColumn));
Grid.Columns.DataColumns[column.Key].FilterColumnSettings.RowFilterOperands.Add((FilterOperand)Activator.CreateInstance(notNullType, column.FilterColumn));
}

}

and in CustomTemplateColumn

public string FilterColumn
{
get { return (string)GetValue(FilterColumnProperty); }
set { SetValue(FilterColumnProperty, value); }
}

public static readonly DependencyProperty FilterColumnProperty = DependencyProperty.Register(
"FilterColumn",
typeof(string),
typeof(CustomTemplateColumn),
null);
}

Thanks

Regards