Create a Custom Filter

Public Class GreaterThan5
   Inherits FilterOperand
   Protected Overrides ReadOnly Property DefaultDisplayName As String
      Get
         Return "Greater Than 5"
      End Get
   End Property
   Public Overrides ReadOnly Property RequiresFilteringInput As Boolean
      Get
         Return false
      End Get
   End Property
   ' Create filter expression that returns all products whose id is greater than 5
   Public Overrides Function FilteringExpression(ByVal value As Object) As System.Linq.Expressions.Expression
      Dim expr As System.Linq.Expressions.Expression
      ((Not (product) Is Nothing) _
      AndAlso (product.ProductID > 5))
      Return expr
   End Function
End Class

public class GreaterThan5 : FilterOperand
{
   protected override string DefaultDisplayName
   {
      get
      {
         return "Greater Than 5";
      }
   }
   public override bool RequiresFilteringInput
   {
      get
      {
         return false;
      }
   }
   // Create filter expression that returns all products whose id is greater than 5
   public override System.Linq.Expressions.Expression FilteringExpression(object value)
   {
      System.Linq.Expressions.Expression<Func<Product, bool>> expr = product => product != null && product.ProductID > 5;
      return expr;
   }
}

<UserControl.Resources>
   <DataTemplate x:Key="GreaterThanFiveIcon">
      <StackPanel>
         <TextBlock Text="&gt;5" FontWeight="Bold" />
      </StackPanel>
   </DataTemplate>
</UserControl.Resources>

Dim _greaterThanFiveIcon As DataTemplate = Nothing

// Member Variable
private DataTemplate _greaterThanFiveIcon = null;

' Assign the data template created in XAML
_greaterThanFiveIcon = CType(Me.Resources("GreaterThanFiveIcon"),DataTemplate)
Dim fcs As FilterColumnSettings = Me.MyDataGrid.Columns.DataColumns("ProductID").FilterColumnSettings
fcs.RowFilterOperands.Add(New GreaterThan5())

// Assign the data template created in XAML
_greaterThanFiveIcon = this.Resources["GreaterThanFiveIcon"] as DataTemplate;
FilterColumnSettings fcs = this.MyDataGrid.Columns.DataColumns["ProductID"].FilterColumnSettings;
fcs.RowFilterOperands.Add(new GreaterThan5(){Icon = this._greaterThanFiveIcon});