Если кто-то работал с Avalonia

У меня почему-то не работают стили с псевдоклассами. Я уже вроде нашел ошибку в документации

https://docs.avaloniaui.net/docs/styling/troubleshooting . Но не могу разобраться.

<Styles xmlns="https://github.com/avaloniaui"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Design.PreviewWith>
<Border Padding="20">
<!-- Add Controls for Previewer Here -->
</Border>
</Design.PreviewWith>

<!-- Add Styles Here -->
<Style Selector="Button">
<Setter Property="HorizontalContentAlignment" Value="Center"></Setter>
<Setter Property="VerticalContentAlignment" Value="Center"></Setter>
</Style>
<Style Selector="Button:hover /template/ ContentPresenter">
<Setter Property="Background" Value="Blue"/>
</Style>
<Style Selector="Button:pressed">
<Setter Property="Background" Value="Red"></Setter>
</Style>
</Styles>

Код

<Styles xmlns="https://github.com/avaloniaui"

        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

    <Design.PreviewWith>

        <Border Padding="20">

            <!-- Add Controls for Previewer Here -->

        </Border>

    </Design.PreviewWith>



    <!-- Add Styles Here -->

    <Style Selector="Button">

        <Setter Property="HorizontalContentAlignment" Value="Center"></Setter>

        <Setter Property="VerticalContentAlignment" Value="Center"></Setter>

    </Style>

    <Style Selector="Button:hover /template/ ContentPresenter">

        <Setter Property="Background" Value="Blue"/>

    </Style>

    <Style Selector="Button:pressed">

        <Setter Property="Background" Value="Red"></Setter>

    </Style>

</Styles>