Avalonia/samples/XamlTestApplicationPcl/ScrollViewer.paml

<Style xmlns="https://github.com/perspex" Selector="ScrollViewer">
  <Setter Property="Template">
    <ControlTemplate>
      <Grid ColumnDefinitions="*,Auto" RowDefinitions="*,Auto">
        <ScrollContentPresenter Content="{TemplateBinding Content}"
                                Extent="{TemplateBinding Path=Extent, Mode=TwoWay}"
                                Offset="{TemplateBinding Path=Offset, Mode=TwoWay}"
                                Viewport="{TemplateBinding Path=Viewport, Mode=TwoWay}"
                                CanScrollHorizontally="{TemplateBinding CanScrollHorizontally}"/>
        <ScrollBar Name="horizontalScrollBar"
                   Orientation="Horizontal"
                   Maximum="{TemplateBinding HorizontalScrollBarMaximum}"
                   Value="{TemplateBinding Path=HorizontalScrollBarValue, Mode=TwoWay}"
                   ViewportSize="{TemplateBinding HorizontalScrollBarViewportSize}"
                   Visibility="{TemplateBinding HorizontalScrollBarVisibility}"
                   Grid.Row="1"/>
        <ScrollBar Name="verticalScrollBar"
                   Orientation="Vertical"
                   Maximum="{TemplateBinding VerticalScrollBarMaximum}"
                   Value="{TemplateBinding Path=VerticalScrollBarValue, Mode=TwoWay}"
                   ViewportSize="{TemplateBinding VerticalScrollBarViewportSize}"
                   Visibility="{TemplateBinding VerticalScrollBarVisibility}"
                   Grid.Column="1"/>
      </Grid>
    </ControlTemplate>
  </Setter>
</Style>