message: Remove button focusability (win)
diff: <StackPanel Orientation="Horizontal">
  <TextBlock Name="textBlock" x:FieldModifier="private" Style="{StaticResource Toggl.CaptionBlackText}" Text="This is tag" TextTrimming="CharacterEllipsis"
  MaxWidth="144"/>
  - <Button Click="remove_OnClick" Style="{StaticResource Toggl.CrossButton}" Height="24" Width="24" Margin="0 -3 0 0"/>
  + <Button Click="remove_OnClick" Style="{StaticResource Toggl.CrossButton}" Height="24" Width="24" Margin="0 -3 0 0"
  + IsTabStop="False" Focusable="False" />
  </StackPanel>
  </Border>
  </UserControl>
  