<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:DialogBox">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="viewer:DialogBox">
                    <Border>
                        <Border.Background>
                            <SolidColorBrush Color="Gray" Opacity=".3" />
                        </Border.Background>
                        <Border Background="White" 
                                CornerRadius="10" 
                                Margin="20"
                                VerticalAlignment="Center" 
                                HorizontalAlignment="Center">
                            <Border.Effect>
                                <DropShadowEffect />
                            </Border.Effect>
                            <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center" />
                        </Border>
                    </Border>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

</ResourceDictionary>
