<charting:LinearAxis.AxisLabelStyle>
                            <Style TargetType="charting:AxisLabel">
                                <Setter Property="Template">
                                    <Setter.Value>
                                        <ControlTemplate TargetType="charting:AxisLabel">
                                            <TextBlock Text="{Binding Converter={StaticResource RatingToStringConverter}}"/>
                                        </ControlTemplate>
                                    </Setter.Value>
                                </Setter>
                            </Style>
                        </charting:LinearAxis.AxisLabelStyle>