How to remove icon in Expander control in WPF?

Question

WPF

I want to make a custom header for the Expander control:
1. centered text - done
2. remove the circle icon with an arrow - Google couldn't help with this, those examples that I found just don't work.

<Expander Background="Gray" IsExpanded="True" VerticalAlignment="Top" HorizontalAlignment="Stretch">
    <Expander.Header>
        <TextBlock Text="Expander Title" TextAlignment="Center"/>
    </Expander.Header>
</Expander>

Answer 1

Here is a good example of a custom expander. Read carefully and adapt for yourself.