Disable TabStop on Expander

I set IsTabStop to False, but Tab still navigates to the expander.

Any ideas what am I doing wrong?

<Expander Header="Data" IsTabStop="False">
    <Border Background="White" BorderThickness="0"/>
</Expander>

It looks like a bug in the Expander template:

http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/e51ad4f5-95d3-4c3e-be87-7917e4d81fa0/

Here's a full workaround (ugly, I know):

<Window
 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
 xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
 x:Class="WpfApplication1.MainWindow"
 x:Name="Window"
 Title="MainWindow"
 Width="640" Height="480">
 <Window.Resources>
  <Style x:Key="ExpanderRightHeaderStyle" TargetType="{x:Type ToggleButton}">
   <Setter Property="Template">
    <Setter.Value>
     <ControlTemplate TargetType="{x:Type ToggleButton}">
      <Border Padding="{TemplateBinding Padding}">
       <Grid SnapsToDevicePixels="False" Background="Transparent">
        <Grid.RowDefinitions>
         <RowDefinition Height="19"/>
         <RowDefinition Height="*"/>
        </Grid.RowDefinitions>
        <Grid>
         <Grid.LayoutTransform>
          <TransformGroup>
           <TransformGroup.Children>
            <TransformCollection>
             <RotateTransform Angle="-90"/>
            </TransformCollection>
           </TransformGroup.Children>
          </TransformGroup>
         </Grid.LayoutTransform>
         <Ellipse x:Name="circle" Stroke="DarkGray" HorizontalAlignment="Center" VerticalAlignment="Center" Width="19" Height="19"/>
         <Path x:Name="arrow" Stroke="#666" StrokeThickness="2" HorizontalAlignment="Center" VerticalAlignment="Center" SnapsToDevicePixels="false" Data="M 1,1.5 L 4.5,5 L 8,1.5"/>
        </Grid>
        <ContentPresenter HorizontalAlignment="Center" Margin="0,4,0,0" VerticalAlignment="Top" SnapsToDevicePixels="True" Grid.Row="1" RecognizesAccessKey="True"/>
       </Grid>
      </Border>
      <ControlTemplate.Triggers>
       <Trigger Property="IsChecked" Value="true">
        <Setter Property="Data" TargetName="arrow" Value="M 1,4.5  L 4.5,1  L 8,4.5"/>
       </Trigger>
       <Trigger Property="IsMouseOver" Value="true">
        <Setter Property="Stroke" TargetName="circle" Value="#FF3C7FB1"/>
        <Setter Property="Stroke" TargetName="arrow" Value="#222"/>
       </Trigger>
       <Trigger Property="IsPressed" Value="true">
        <Setter Property="Stroke" TargetName="circle" Value="#FF526C7B"/>
        <Setter Property="StrokeThickness" TargetName="circle" Value="1.5"/>
        <Setter Property="Stroke" TargetName="arrow" Value="#FF003366"/>
       </Trigger>
      </ControlTemplate.Triggers>
     </ControlTemplate>
    </Setter.Value>
   </Setter>
  </Style>
  <Style x:Key="ExpanderUpHeaderStyle" TargetType="{x:Type ToggleButton}">
   <Setter Property="Template">
    <Setter.Value>
     <ControlTemplate TargetType="{x:Type ToggleButton}">
      <Border Padding="{TemplateBinding Padding}">
       <Grid SnapsToDevicePixels="False" Background="Transparent">
        <Grid.ColumnDefinitions>
         <ColumnDefinition Width="19"/>
         <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>
        <Grid>
         <Grid.LayoutTransform>
          <TransformGroup>
           <TransformGroup.Children>
            <TransformCollection>
             <RotateTransform Angle="180"/>
            </TransformCollection>
           </TransformGroup.Children>
          </TransformGroup>
         </Grid.LayoutTransform>
         <Ellipse x:Name="circle" Stroke="DarkGray" HorizontalAlignment="Center" VerticalAlignment="Center" Width="19" Height="19"/>
         <Path x:Name="arrow" Stroke="#666" StrokeThickness="2" HorizontalAlignment="Center" VerticalAlignment="Center" SnapsToDevicePixels="false" Data="M 1,1.5 L 4.5,5 L 8,1.5"/>
        </Grid>
        <ContentPresenter HorizontalAlignment="Left" Margin="4,0,0,0" VerticalAlignment="Center" SnapsToDevicePixels="True" Grid.Column="1" RecognizesAccessKey="True"/>
       </Grid>
      </Border>
      <ControlTemplate.Triggers>
       <Trigger Property="IsChecked" Value="true">
        <Setter Property="Data" TargetName="arrow" Value="M 1,4.5  L 4.5,1  L 8,4.5"/>
       </Trigger>
       <Trigger Property="IsMouseOver" Value="true">
        <Setter Property="Stroke" TargetName="circle" Value="#FF3C7FB1"/>
        <Setter Property="Stroke" TargetName="arrow" Value="#222"/>
       </Trigger>
       <Trigger Property="IsPressed" Value="true">
        <Setter Property="Stroke" TargetName="circle" Value="#FF526C7B"/>
        <Setter Property="StrokeThickness" TargetName="circle" Value="1.5"/>
        <Setter Property="Stroke" TargetName="arrow" Value="#FF003366"/>
       </Trigger>
      </ControlTemplate.Triggers>
     </ControlTemplate>
    </Setter.Value>
   </Setter>
  </Style>
  <Style x:Key="ExpanderLeftHeaderStyle" TargetType="{x:Type ToggleButton}">
   <Setter Property="Template">
    <Setter.Value>
     <ControlTemplate TargetType="{x:Type ToggleButton}">
      <Border Padding="{TemplateBinding Padding}">
       <Grid SnapsToDevicePixels="False" Background="Transparent">
        <Grid.RowDefinitions>
         <RowDefinition Height="19"/>
         <RowDefinition Height="*"/>
        </Grid.RowDefinitions>
        <Grid>
         <Grid.LayoutTransform>
          <TransformGroup>
           <TransformGroup.Children>
            <TransformCollection>
             <RotateTransform Angle="90"/>
            </TransformCollection>
           </TransformGroup.Children>
          </TransformGroup>
         </Grid.LayoutTransform>
         <Ellipse x:Name="circle" Stroke="DarkGray" HorizontalAlignment="Center" VerticalAlignment="Center" Width="19" Height="19"/>
         <Path x:Name="arrow" Stroke="#666" StrokeThickness="2" HorizontalAlignment="Center" VerticalAlignment="Center" SnapsToDevicePixels="false" Data="M 1,1.5 L 4.5,5 L 8,1.5"/>
        </Grid>
        <ContentPresenter HorizontalAlignment="Center" Margin="0,4,0,0" VerticalAlignment="Top" SnapsToDevicePixels="True" Grid.Row="1" RecognizesAccessKey="True"/>
       </Grid>
      </Border>
      <ControlTemplate.Triggers>
       <Trigger Property="IsChecked" Value="true">
        <Setter Property="Data" TargetName="arrow" Value="M 1,4.5  L 4.5,1  L 8,4.5"/>
       </Trigger>
       <Trigger Property="IsMouseOver" Value="true">
        <Setter Property="Stroke" TargetName="circle" Value="#FF3C7FB1"/>
        <Setter Property="Stroke" TargetName="arrow" Value="#222"/>
       </Trigger>
       <Trigger Property="IsPressed" Value="true">
        <Setter Property="Stroke" TargetName="circle" Value="#FF526C7B"/>
        <Setter Property="StrokeThickness" TargetName="circle" Value="1.5"/>
        <Setter Property="Stroke" TargetName="arrow" Value="#FF003366"/>
       </Trigger>
      </ControlTemplate.Triggers>
     </ControlTemplate>
    </Setter.Value>
   </Setter>
  </Style>
  <Style x:Key="ExpanderHeaderFocusVisual">
   <Setter Property="Control.Template">
    <Setter.Value>
     <ControlTemplate>
      <Border>
       <Rectangle Stroke="Black" StrokeDashArray="1 2" StrokeThickness="1" Margin="0" SnapsToDevicePixels="true"/>
      </Border>
     </ControlTemplate>
    </Setter.Value>
   </Setter>
  </Style>
  <Style x:Key="ExpanderDownHeaderStyle" TargetType="{x:Type ToggleButton}">
   <Setter Property="Template">
    <Setter.Value>
     <ControlTemplate TargetType="{x:Type ToggleButton}">
      <Border Padding="{TemplateBinding Padding}">
       <Grid SnapsToDevicePixels="False" Background="Transparent">
        <Grid.ColumnDefinitions>
         <ColumnDefinition Width="19"/>
         <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>
        <Ellipse x:Name="circle" Stroke="DarkGray" HorizontalAlignment="Center" VerticalAlignment="Center" Width="19" Height="19"/>
        <Path x:Name="arrow" Stroke="#666" StrokeThickness="2" HorizontalAlignment="Center" VerticalAlignment="Center" SnapsToDevicePixels="false" Data="M 1,1.5 L 4.5,5 L 8,1.5"/>
        <ContentPresenter HorizontalAlignment="Left" Margin="4,0,0,0" VerticalAlignment="Center" SnapsToDevicePixels="True" Grid.Column="1" RecognizesAccessKey="True"/>
       </Grid>
      </Border>
      <ControlTemplate.Triggers>
       <Trigger Property="IsChecked" Value="true">
        <Setter Property="Data" TargetName="arrow" Value="M 1,4.5  L 4.5,1  L 8,4.5"/>
       </Trigger>
       <Trigger Property="IsMouseOver" Value="true">
        <Setter Property="Stroke" TargetName="circle" Value="#FF3C7FB1"/>
        <Setter Property="Stroke" TargetName="arrow" Value="#222"/>
       </Trigger>
       <Trigger Property="IsPressed" Value="true">
        <Setter Property="Stroke" TargetName="circle" Value="#FF526C7B"/>
        <Setter Property="StrokeThickness" TargetName="circle" Value="1.5"/>
        <Setter Property="Stroke" TargetName="arrow" Value="#FF003366"/>
       </Trigger>
      </ControlTemplate.Triggers>
     </ControlTemplate>
    </Setter.Value>
   </Setter>
  </Style>
  <Style x:Key="ExpanderStyle1" TargetType="{x:Type Expander}">
   <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
   <Setter Property="Background" Value="Transparent"/>
   <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
   <Setter Property="VerticalContentAlignment" Value="Stretch"/>
   <Setter Property="BorderBrush" Value="Transparent"/>
   <Setter Property="BorderThickness" Value="1"/>
   <Setter Property="Template">
    <Setter.Value>
     <ControlTemplate TargetType="{x:Type Expander}">
      <Border SnapsToDevicePixels="true" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" CornerRadius="3">
       <DockPanel>
        <ToggleButton x:Name="HeaderSite" Focusable="{TemplateBinding Focusable}" FocusVisualStyle="{StaticResource ExpanderHeaderFocusVisual}" Margin="1" MinHeight="0" MinWidth="0" Style="{StaticResource ExpanderDownHeaderStyle}" Content="{TemplateBinding Header}" ContentTemplate="{TemplateBinding HeaderTemplate}" ContentTemplateSelector="{TemplateBinding HeaderTemplateSelector}" FontFamily="{TemplateBinding FontFamily}" FontSize="{TemplateBinding FontSize}" FontStretch="{TemplateBinding FontStretch}" FontStyle="{TemplateBinding FontStyle}" FontWeight="{TemplateBinding FontWeight}" Foreground="{TemplateBinding Foreground}" HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" Padding="{TemplateBinding Padding}" VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}" IsChecked="{Binding IsExpanded, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" DockPanel.Dock="Top"/>
        <ContentPresenter x:Name="ExpandSite" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" Focusable="false" Visibility="Collapsed" DockPanel.Dock="Bottom"/>
       </DockPanel>
      </Border>
      <ControlTemplate.Triggers>
       <Trigger Property="IsExpanded" Value="true">
        <Setter Property="Visibility" TargetName="ExpandSite" Value="Visible"/>
       </Trigger>
       <Trigger Property="ExpandDirection" Value="Right">
        <Setter Property="DockPanel.Dock" TargetName="ExpandSite" Value="Right"/>
        <Setter Property="DockPanel.Dock" TargetName="HeaderSite" Value="Left"/>
        <Setter Property="Style" TargetName="HeaderSite" Value="{StaticResource ExpanderRightHeaderStyle}"/>
       </Trigger>
       <Trigger Property="ExpandDirection" Value="Up">
        <Setter Property="DockPanel.Dock" TargetName="ExpandSite" Value="Top"/>
        <Setter Property="DockPanel.Dock" TargetName="HeaderSite" Value="Bottom"/>
        <Setter Property="Style" TargetName="HeaderSite" Value="{StaticResource ExpanderUpHeaderStyle}"/>
       </Trigger>
       <Trigger Property="ExpandDirection" Value="Left">
        <Setter Property="DockPanel.Dock" TargetName="ExpandSite" Value="Left"/>
        <Setter Property="DockPanel.Dock" TargetName="HeaderSite" Value="Right"/>
        <Setter Property="Style" TargetName="HeaderSite" Value="{StaticResource ExpanderLeftHeaderStyle}"/>
       </Trigger>
       <Trigger Property="IsEnabled" Value="false">
        <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
       </Trigger>
      </ControlTemplate.Triggers>
     </ControlTemplate>
    </Setter.Value>
   </Setter>
  </Style>
 </Window.Resources>

 <Grid x:Name="LayoutRoot">
  <Expander Focusable="False" Margin="68,81,293,0" VerticalAlignment="Top" Height="77" Header="Expander" Style="{DynamicResource ExpanderStyle1}">
   <Grid/>
  </Expander>
 </Grid>
</Window>