SeriesValueModifier markers not displayed

Hello,
I have charts

    <s:SciChartSurface Grid.Row="0" Grid.Column="0" x:Name="SciChartSurface" Margin="3" Padding="3"
                       ChartTitle="{mainVM:Localization ChartMainSciChartSurface}" YAxes="{s:AxesBinding YAxes}" RenderableSeries="{s:SeriesBinding RenderableSeries}" Annotations="{s:AnnotationsBinding Annotations}">
        <s:SciChartSurface.XAxis>
            <s:NumericAxis AxisTitle="{mainVM:Localization ChartAxisXTitle}" VisibleRange="{Binding VisibleRangeXAxis, Mode=TwoWay}" />
        </s:SciChartSurface.XAxis>
        <s:SciChartSurface.ChartModifier>
            <s:ModifierGroup>
                <s:SeriesValueModifier />
                <s:CursorModifier IsEnabled="{Binding IsShowValuesCursor}" />
                <s:LegendModifier x:Name="SciChartLegendModifier" GetLegendDataFor="AllSeries" ShowLegend="False"
                                  SeriesData="{Binding SeriesData, Mode=TwoWay}" />
            </s:ModifierGroup>
        </s:SciChartSurface.ChartModifier>
    </s:SciChartSurface>

As you see I have SeriesValueModifier tag but I cant see markers and values

I found rule “The SeriesValueModifier works on a single axis. You can change which axis by setting the SeriesValueModifier.YAxisId Property”. Is it mean what I can add markers only on one of Y axis?