Я понял это, используя Scatter Series и растянутую линию:
<DVC:ScatterSeries DependentValuePath="Value" IndependentValuePath="Key" >
<DVC:ScatterSeries.LegendItemStyle>
<Style TargetType="{x:Type DVC:LegendItem}">
<Setter Property="Visibility" Value="Collapsed"/>
</Style>
</DVC:ScatterSeries.LegendItemStyle>
<DVC:ScatterSeries.DataPointStyle>
<Style TargetType="DVC:ScatterDataPoint">
<Setter Property="BorderBrush" Value="Red" />
<Setter Property="Width" Value="4000" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="DVC:ScatterDataPoint">
<Grid x:Name="Root">
<Line X1="0" Y1="0" X2="1" Y2="0" Stroke="{TemplateBinding BorderBrush}" Stretch="Fill" StrokeThickness="2"/>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</DVC:ScatterSeries.DataPointStyle>
</DVC:ScatterSeries>