Gridview RowDetailsTemplate

[Li]

Hi,
I copy MyDataRow.cs and MyModel.cs (GridView Various Data Source - Demo) to my project.
Data in Telerik:RadGridView.Columns show correctly but data in Telerik:RadGridView.RowDetailsTemplate is blank.
Please advise me how to show it correctly. 
Thanks.

Below is my code.

<UserControl.Resources>
        <local:MyModel x:Key="model"></local:MyModel>
    </UserControl.Resources>

    <Grid x:Name="LayoutRoot">
        <Telerik:RadGridView x:Name="grid1"
                              telerik:StyleManager.Theme="Windows8"
                              GroupRenderMode="Flat"
                              RowIndicatorVisibility="Collapsed"
                              IsReadOnly="True"
                              Width="850"
                              MinHeight="300"
                              MaxHeight="500"
                              AutoGenerateColumns="False"
                              CanUserFreezeColumns="False"
                              CanUserResizeColumns="False"
                              Grid.ColumnSpan="2"
                              ShowGroupPanel="False"
                              ItemsSource="{Binding Data, Source={StaticResource model}}">
            <Telerik:RadGridView.Columns>
                <Telerik:GridViewToggleRowDetailsColumn />
                <Telerik:GridViewDataColumn Header="Transaction Date" Width="*" DataMemberBinding="{Binding Date}" UniqueName="TransactionDate"/>
                <Telerik:GridViewDataColumn Header="Transaction Type" Width="*" DataMemberBinding="{Binding Src}" UniqueName="TransactionType"/>
                <Telerik:GridViewDataColumn Header="Income Category" Width="*" DataMemberBinding="{Binding Cat}" UniqueName="Income Category"/>
                <Telerik:GridViewDataColumn Header="Description" Width="200" DataMemberBinding="{Binding Description}" UniqueName="Description"/>
                <Telerik:GridViewDataColumn Header="Transaction Amount" Width="*" DataMemberBinding="{Binding Transaction_Amount}" UniqueName="Amount"/>
                <Telerik:GridViewDataColumn Header="Open Amount" Width="*" DataMemberBinding="{Binding Open_Amt}" UniqueName="OpenAmount"/>
            </Telerik:RadGridView.Columns>
            <Telerik:RadGridView.RowDetailsTemplate>
                <DataTemplate>
                    <Telerik:RadTabControl x:Name="RadTabControl1" telerik:StyleManager.Theme="Windows8"
                                           Width="800"
                                           HorizontalAlignment="Center"
                                           VerticalAlignment="Center"
                                           Margin="0,20,0,20">
                        <Telerik:RadTabItem Header="Details"
                                            Margin="0,0,0,0"
                                            Height="24">
                            <Grid>
                                <Grid.RowDefinitions>
                                    <RowDefinition />
                                    <RowDefinition />
                                    <RowDefinition />
                                    <RowDefinition />
                                    <RowDefinition />
                                    <RowDefinition />
                                </Grid.RowDefinitions>
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition Width="Auto" />
                                    <ColumnDefinition Width="Auto" />
                                    <ColumnDefinition Width="Auto" />
                                </Grid.ColumnDefinitions>
                                <TextBlock Text="Invoice No: "
                                           Margin="10,5,0,0"
                                           Foreground="Black"
                                           FontWeight="Bold"
                                           Grid.Row="0"
                                           Grid.Column="1">
                                </TextBlock>
                                <TextBlock Text="{Binding Invoice}"
                                           Margin="10,5,0,0"
                                           Foreground="Black"
                                           Grid.Row="0"
                                           Grid.Column="2">
                                </TextBlock>
                                <TextBlock Text="Receipt No: "
                                           Margin="10,0,0,0"
                                           Foreground="Black"
                                           FontWeight="Bold"
                                           Grid.Row="1"
                                           Grid.Column="1">
                                </TextBlock>
                                <TextBlock Text="{Binding Receipt_Descriptor}"
                                           Margin="10,0,0,0"
                                           Foreground="Black"
                                           Grid.Row="1"
                                           Grid.Column="2">
                                </TextBlock>
                                <TextBlock Text="Batch No: "
                                           Margin="10,0,0,0"
                                           Foreground="Black"
                                           FontWeight="Bold"
                                           Grid.Row="2"
                                           Grid.Column="1">
                                </TextBlock>
                                <TextBlock Text="{Binding BatchID}"
                                           Margin="10,0,0,0"
                                           Foreground="Black"
                                           Grid.Row="2"
                                           Grid.Column="2">
                                </TextBlock>
                                <TextBlock Text="Currency Code: "
                                           Margin="10,0,0,0"
                                           Foreground="Black"
                                           FontWeight="Bold"
                                           Grid.Row="3"
                                           Grid.Column="1">
                                </TextBlock>
                                <TextBlock Text="{Binding Entry_Currency}"
                                           Margin="10,0,0,0"
                                           Foreground="Black"
                                           Grid.Row="3"
                                           Grid.Column="2">
                                </TextBlock>
                                <TextBlock Text="Income Category: "
                                           Margin="10,0,0,0"
                                           Foreground="Black"
                                           FontWeight="Bold"
                                           Grid.Row="4"
                                           Grid.Column="1">
                                </TextBlock>
                                <TextBlock Text="{Binding Cat}"
                                           Margin="10,0,0,0"
                                           Foreground="Black"
                                           Grid.Row="4"
                                           Grid.Column="2">
                                </TextBlock>
                                <TextBlock Text="Description: "
                                           Margin="10,0,0,0"
                                           Foreground="Black"
                                           FontWeight="Bold"
                                           Grid.Row="5"
                                           Grid.Column="1">
                                </TextBlock>
                                <TextBlock Text="{Binding Description}"
                                           Margin="10,0,0,10"
                                           Foreground="Black"
                                           Grid.Row="5"
                                           Grid.Column="2">
                                </TextBlock>
                            </Grid>
                    </Telerik:RadTabControl>
                </DataTemplate>
            </Telerik:RadGridView.RowDetailsTemplate>
        </Telerik:RadGridView>
    </Grid>