SciChart WPF doesn't display properly inside of a grid

I have a SciChart WPF control which works as expected when it is in a dedicated window, but if I place it inside of a grid it will not display properly. As you can see in the picture below, it displays the background and Axis properly, but the actual chart itself in the center is very tiny.

XAML

<UserControl …
             xmlns:s="http://schemas.abtsoftware.co.uk/scichart">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="1*" />
            <RowDefinition Height="Auto" />
            <RowDefinition Height="2*"/>
        </Grid.RowDefinitions>
        <Grid Grid.Row="0">
            Some other stuff
        </Grid>
        <GridSplitter Grid.Row="1" Height="5" HorizontalAlignment="Stretch" />
        <s:SciChartSurface Grid.Row="2" x:Name="SciChartSurface">
            <s:SciChartSurface.XAxis>
                <s:DateTimeAxis AxisTitle="Time"/>
            </s:SciChartSurface.XAxis>
            <s:SciChartSurface.YAxis>
                <s:NumericAxis/>
            </s:SciChartSurface.YAxis>
            <s:SciChartSurface.ChartModifier>
                <s:ModifierGroup>
                    <s:RubberBandXyZoomModifier />
                    <s:ZoomExtentsModifier />
                </s:ModifierGroup>
            </s:SciChartSurface.ChartModifier>
        </s:SciChartSurface>
    </Grid>
</UserControl>