How to remove blue background from crystal report viewer in wpf

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.NET

XAML

WPF

C#5.0

CrystalReports

Hello guys.

I am developing a project in WPF ,C#, Crystal Reports, MS sql Server. The project is 99% complete but 1% issue is to remove the blue background from the Report viewer.I googled but did'nt find any thing.

Any help would be appreciated.
Thanks.

My Xaml code is:

<Grid>
        <Border Style="{StaticResource RoundBorder}" Margin="10" CornerRadius="50" BorderBrush="SteelBlue">
            <Border.Background>
                <SolidColorBrush Opacity="0.5" Color="#333" />
            </Border.Background>

            <Grid>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition />
                </Grid.ColumnDefinitions>
                <Grid.RowDefinitions >
                    <RowDefinition Height="30" />
                    <RowDefinition />
                </Grid.RowDefinitions>

                <Button Name="CloseButton" Click="CloseButton_Click" Content="X" FontSize="16" FontWeight="Bold" Style="{StaticResource GlassButton}" Grid.Row="0" Grid.Column="0" HorizontalAlignment="Right"  Foreground="Red" Width="30"/>
                <Viewer:CrystalReportsViewer Name="CrystalReportViewer1" Grid.Column="0" Grid.Row="1" Margin="10 10 10 30" Background="Transparent" ToggleSidePanel="None"  BorderBrush="Transparent"  OverridesDefaultStyle="True"   ShowToolbar="False" ShowStatusbar="False" ></Viewer:CrystalReportsViewer>

            </Grid>
        </Border>
    </Grid>

</Window>