<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:viewer="clr-namespace:Telerik.ReportViewer.Silverlight;assembly=Telerik.ReportViewer.Silverlight">

    <Style TargetType="viewer:ErrorStatus">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="viewer:ErrorStatus">
                    <Grid x:Name="LayoutRoot" >
                        <Ellipse Fill="Red"/>
                        <TextBlock Foreground="White" 
                                   HorizontalAlignment="Center" 
                                   VerticalAlignment="Stretch" 
                                   FontWeight="Bold" >!</TextBlock>
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</ResourceDictionary>
