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Why I can't see VerticalLineAnnotation Label?

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I have this

private readonly string CHART_MARKER_TEXT = "Marker";
private readonly string CHART_MARKER_STYLE = "VerticalLineAnnotationStyle"; // defined in Chart.xaml

    AddVerticalLineAnnotation(new AnnotationRequest() { XValue = 3, LabelText = CHART_MARKER_TEXT, AnnotationStyle = CHART_MARKER_STYLE });

private void AddVerticalLineAnnotation(AnnotationRequest request)
    Annotations.Add(new VerticalLineAnnotationViewModel
        X1 = request.XValue,
        LabelValue = !string.IsNullOrEmpty(request.LabelText) ? request.LabelText : null,
        VerticalAlignment = VerticalAlignment.Stretch,
        LabelPlacement = LabelPlacement.Left,
        LabelsOrientation = System.Windows.Controls.Orientation.Vertical,
        StyleKey = request.AnnotationStyle,

And this

<Style x:Key="VerticalLineAnnotationStyle" TargetType="{x:Type s:VerticalLineAnnotation}">
    <Setter Property="Stroke" Value="Orange" />
    <Setter Property="StrokeThickness" Value="2" />
    <Setter Property="FontSize" Value="12" />
    <Setter Property="FontWeight" Value="Bold" />

Why I can’t see Label?

enter image description here
enter image description here

  • Fedor Iudin
    Hm… Label not shown by default. This if solution: Setter Property=”ShowLabel” Value=”True”
  • Andrew Burnett-Thompson
    Hi Fedor, thanks for the well formed question & answer. You are right, the answer is indeed set VerticalLineAnnotation.ShowLabel = true. This should be both on the VerticalLineAnnotation as well as the VerticalLineAnnotationViewModel for MVVM. Thanks!
  • Fedor Iudin
    And what the difference between VerticalLineAnnotation and VerticalLineAnnotationForMvvm?
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