UIElementsExample.xaml

<Page
    x:Class="UWP.CartesianChart.UIElements.UIElementsExample"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:UWP.CartesianChart.UIElements"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:lvc="using:LiveCharts.Uwp"
    mc:Ignorable="d">

    <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"></RowDefinition>
            <RowDefinition Height="*"></RowDefinition>
        </Grid.RowDefinitions>
        <lvc:CartesianChart Grid.Row="1" x:Name="Chart">
            <lvc:CartesianChart.Series>
                <lvc:LineSeries Values="{Binding Values1}" Fill="Transparent" StrokeThickness="4" 
                                Canvas.ZIndex="2" PointGeometry="{x:Null}"/>
                <lvc:ColumnSeries Values="{Binding Values2}" Canvas.ZIndex="1"/>
            </lvc:CartesianChart.Series>
            <lvc:CartesianChart.VisualElements>
                <lvc:VisualElement X="0.5" Y="7" 
                                   HorizontalAlignment="Center" VerticalAlignment="Top">
                    <lvc:VisualElement.UIElement>
                        <TextBlock FontWeight="Bold" FontSize="16" Opacity=".6">
                           Warning!
                        </TextBlock>
                    </lvc:VisualElement.UIElement>
                </lvc:VisualElement>
                <lvc:VisualElement X="0.5" Y="6.9" 
                                   HorizontalAlignment="Center" VerticalAlignment="Bottom">
                    <lvc:VisualElement.UIElement>
                        <Image Source="warning.png" Height="24" Width="24"></Image>
                    </lvc:VisualElement.UIElement>
                </lvc:VisualElement>
            </lvc:CartesianChart.VisualElements>
            <lvc:CartesianChart.AxisY>
                <lvc:Axis IsMerged="True">
                    <lvc:Axis.Sections>
                        <lvc:AxisSection Value="7" 
                                         Stroke="YellowGreen" 
                                         StrokeThickness="3"/>
                    </lvc:Axis.Sections>
                </lvc:Axis>
            </lvc:CartesianChart.AxisY>
            <lvc:CartesianChart.AxisX>
                <lvc:Axis Labels="{x:Bind Labels}">
                    <lvc:Axis.Separator>
                        <lvc:Separator Step="1"/>
                    </lvc:Axis.Separator>
                </lvc:Axis>
            </lvc:CartesianChart.AxisX>
        </lvc:CartesianChart>
    </Grid>
</Page>