Crystal Report Viewer Null in Xaml.cs

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C#

WPF

CrystalReports

reporting

Hello,
I am integrating crystal reportviewer in WPF Application. I referenced SAPBusinessObjects.WPF.Viewer and SAPBusinessObjects.WPF.ViewerShared dll. I can see crystalreportviewer control in my design.But in my xaml.cs Crystalreportviwer control is showing null. I dont know where i am going wrong.I am developing in VS 2012 , .Net frameWork 3.5 and CR 13 is installed in my pc. Following code is my xaml code.

Window x:Class="WpfCrystalReport.frmLabelTemplate1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:my="clr-namespace:SAPBusinessObjects.WPF.Viewer;assembly=SAPBusinessObjects.WPF.Viewer"
Title="MainWindow" Height="350" Width="525"
Grid
my:CrystalReportsViewer HorizontalAlignment="Left" Name="crystalReportsViewer1"
VerticalAlignment="Top" Height="500" Width="500"
Grid
Window

If you have any solution please let me know.