Hello Doguhan,
You've missed 1 important attribute in the RadiaGauge element telerik:StyleManager.Theme="Metro". The right XAML should looks like the following:
<UserControl x:Class="SilverlightApplication2.MainPage"
xmlns:my="clr-namespace:SilverlightApplication2" d:DesignHeight="300" d:DesignWidth="400"
xmlns:vsm="clr-namespace:System.Windows;assembly=System.Windows"
<UserControl.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="/Telerik.Windows.Themes.Metro;component/Themes/Metro/Gauge.xaml" />
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</UserControl.Resources>
<Grid x:Name="LayoutRoot" Background="White">
<telerik:RadGauge telerik:StyleManager.Theme="Metro">
<telerik:RadialGauge telerik:StyleManager.Theme="Metro"
Height="100" Width="100"
Style="{StaticResource RadialGaugeQuarterCircleNWStyle}">
<telerik:RadialScale Min="20" Max="40" MiddleTicks="1" MajorTicks="5"
Style="{StaticResource RadialScaleQuarterCircleNWStyle}">
<telerik:RadialScale.MiddleTick>
<telerik:MiddleTickProperties Length="0.08" />
</telerik:RadialScale.MiddleTick>
<telerik:RadialScale.MajorTick>
<telerik:MajorTickProperties Length="0.11" />
</telerik:RadialScale.MajorTick>
<telerik:RadialScale.Label>
<telerik:LabelProperties FontSize="10" Location="Outside" />
</telerik:RadialScale.Label>
<telerik:IndicatorList>
<telerik:RadialBar Value="38" />
<telerik:Needle IsAnimated="True" Value="21" />
</telerik:IndicatorList>
</telerik:RadialScale>
</telerik:RadialGauge>
</telerik:RadGauge>
</Grid>
</UserControl>
All the best,
Andrey Murzov
the Telerik team
Explore the entire Telerik portfolio by downloading the Ultimate Collection trial package. Get it now >>