WPF

<Menu.Resources>
    <ControlTemplate x:Key="Template" TargetType="{x:Type RadioButton}">
     <Border Background="Transparent">

     <MenuItem Header="{TemplateBinding Content}" IsCheckable="False" IsChecked="{TemplateBinding IsChecked}" IsHitTestVisible="False" Padding="2,3" HorizontalAlignment="Stretch">

     </MenuItem>
     </Border>
     </ControlTemplate>
</Menu.Resources>

<MenuItem Header="Me">

    <StackPanel>
        <RadioButton Content="Foo" Template="{StaticResource Template}"/>
        <RadioButton Content="Bar" Template="{StaticResource Template}"/>
        <RadioButton Content="Biz" Template="{StaticResource Template}"/>
</StackPanel>

<UserControl.Resources>
    <ResourceDictionary>
        <ResourceDictionary.MergedDictionaries>
            <ResourceDictionary Source="pack://application:,,,/Common;component/AppResources.xaml" />
        </ResourceDictionary.MergedDictionaries>
    </ResourceDictionary>
</UserControl.Resources>

<toolkit:Chart  Name="Chart3" Title="Repeat Sales" VerticalAlignment="Top" Margin="33,330,176,0"

Height="262">
                <toolkit:PieSeries ItemsSource="{Binding}" IndependentValuePath="Name"

DependentValuePath="Types" IsSelectionEnabled="True"  >
                </toolkit:PieSeries>
            </toolkit:Chart>

[TemplatePart(Name = ComboBoxControl.INPUTCOMBOBOX_NAME, Type = typeof(ComboBox))]
    public class ComboBoxControl : Control
    {
        #region Constants
        const String CATEGORY_NAME = "Custom ComboBox Control";
        const String INPUTCOMBOBOX_NAME = "PART_InputComboBox";
        #endregion

        #region Properties
        ComboBox _inputComboBox;
        #endregion

        #region Dependency Properties
        public static readonly DependencyProperty DisplayMemberPathProperty =
            DependencyProperty.Register("DisplayMemberPath", typeof(string), typeof(ComboBoxControl), new UIPropertyMetadata(String.Empty));

        public static readonly DependencyProperty ItemsSourceProperty =
            DependencyProperty.Register("ItemsSource", typeof(IEnumerable), typeof(ComboBoxControl), new UIPropertyMetadata());

        // Other properties omitted
        #endregion

        #region Dependency Public Properties
        public string DisplayMemberPath
        {
            get { return (string)GetValue(DisplayMemberPathProperty); }
            set { SetValue(DisplayMemberPathProperty, value); }
        }

        public object ItemsSource
        {
            get { return (System.Collections.IEnumerable)GetValue(ItemsSourceProperty); }
            set { SetValue(ItemsSourceProperty, value); }
        }

        // Other properties omitted        
        #endregion

        #region Constructor
        public ComboBoxControl() { }

        static ComboBoxControl()
        {
            DefaultStyleKeyProperty.OverrideMetadata(typeof(ComboBoxControl), new FrameworkPropertyMetadata(typeof(ComboBoxControl)));
        }
        #endregion

        public override void OnApplyTemplate()
        {
            base.OnApplyTemplate();

            _inputComboBox = (ComboBox)GetTemplateChild(INPUTCOMBOBOX_NAME);
        }
}

<Style TargetType="{x:Type local:ComboBoxControl}">
        <Setter Property="Label" Value=""/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type local:ComboBoxControl}">
                    <Border>
                        <DockPanel>

                            <!-- COMBO BOX  -->
                            <ComboBox x:Name="PART_InputComboBox" VerticalAlignment="Stretch" MinHeight="30"
                                      DisplayMemberPath="{TemplateBinding DisplayMemberPath}" 
                                      ItemsSource="{Binding Path=ItemsSource, Mode=TwoWay, RelativeSource={RelativeSource Mode=FindAncestor, 
                                AncestorType={x:Type local:ComboBoxControl}}, UpdateSourceTrigger=PropertyChanged}"/>
                        </DockPanel>
                    </Border>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

<ctl:ComboBoxControl ItemsSource="{Binding Path=Users, Mode=TwoWay}"/>