In WPF, how to set an outer, centered, and inner border?

Question

When I set a border for a button, for example, it is an outer border. But What if I would want it to be centered or inner, what would be the simplest way?

Here is what I mean:

Answer 1

So to re-create your example, here's quickie concept example alternatives. However there's a bunch of different ways you can accomplish the same effects but here's at least a few...

<StackPanel>
    <StackPanel.Resources>
        <Style TargetType="Border">
            <Setter Property="BorderBrush" Value="#570000FF"/>
            <Setter Property="BorderThickness" Value="10"/>
            <Setter Property="Height" Value="50"/>
            <Setter Property="Width" Value="100"/>
            <Setter Property="Margin" Value="10"/>
        </Style>
        <Style TargetType="Rectangle">
            <Setter Property="Stroke" Value="Black"/>
            <Setter Property="StrokeThickness" Value="1"/>
        </Style>
    </StackPanel.Resources>

    <Border>
        <Rectangle/>
    </Border>

    <Border>
        <Rectangle Margin="-5"/>
    </Border>

    <Border BorderBrush="Black" BorderThickness="1">
        <Rectangle Stroke="#570000FF" StrokeThickness="10"/>
    </Border>

</StackPanel>

Result:

Hope this helps, cheers.