The XamRadialGauge™ control’s template RootElement is now a Grid instead of a ContentPresenter. All existing styles for the XamRadialGauge control which modify the template must be updated with this change to avoid runtime exceptions.
In XAML:
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="local:XamRadialGauge">
<Grid UseLayoutRounding=">
<Grid.RowDefinitions>
<RowDefinition Height="85*" />
<RowDefinition Height="30*" />
<RowDefinition Height="85*" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="85*" />
<ColumnDefinition Width="30*" />
<ColumnDefinition Width="85*" />
</Grid.ColumnDefinitions>
<Ellipse x:Name="background"
Grid.RowSpan="3"
Grid.ColumnSpan="3"
Stroke="{TemplateBinding BorderBrush}"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"
Width="Auto"
Height="Auto"
Fill="{TemplateBinding Background}"
StrokeThickness="10" />
<Ellipse x:Name="OuterBorder"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"
Width="Auto"
Height="Auto"
StrokeThickness="1"
Grid.ColumnSpan="3"
Grid.RowSpan="3"
Stroke="{StaticResource AnchorStroke}" />
<Ellipse x:Name="InnerBorder"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"
Width="Auto"
Height="Auto"
StrokeThickness="1"
Grid.ColumnSpan="3"
Grid.RowSpan="3"
Margin="10,10,10,10">
<Ellipse.Stroke>
<LinearGradientBrush EndPoint="0.5,1"
StartPoint="0.5,0">
<GradientStop Color="#FFA3AEB9" />
<GradientStop Color="#FFE4E7EA"
Offset="1" />
</LinearGradientBrush>
</Ellipse.Stroke>
</Ellipse>
<Grid x:Name="RootElement"
Grid.RowSpan="3"
Grid.ColumnSpan="3"
Margin="{TemplateBinding Padding}" />
<Ellipse x:Name="Anchor"
Grid.Row="1"
Grid.Column="1"
StrokeThickness="2"
Fill="{StaticResource AnchorFill}"
Stroke="{StaticResource AnchorStroke}" />
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>