How to disable the dashed contour for TabItem?

Question

When a TabItem has focus it shows an inner dashed countour. How to make it transparent or to disabling it to get focus at all?

Answer 1

If you're talking about the FocusVisualStyle you can remove it by adding the following to your TabControl

<TabControl ...>
    <TabControl.Resources>
        <Style TargetType="TabItem">
            <Setter Property="FocusVisualStyle" Value="{x:Null}"/>
        </Style>
    </TabControl.Resources>
    <!-- ... -->
</TabControl>

Update

To make sure we're talking about the same thing

Selected with FocusVisualStyle (dashed countour)

Selected without FocusVisualStyle. This is the look you'll get when the TabItem has focused (set by keyboard) and FocusVisualStyle is set to null