Binding data to RadComboBox by domain data source as well as through code behind

[Sagar]

Can we attach domain data source (ria control) and also add items through code behind to one rad combo box in Silverlight?
I've attached domain data source to radcombobox in xaml & want to add one value i.e. "None" to radcombobox which is not in domain source.Is it possible ?
I tried it in domainsource_loadeddata event
radcombobox1.items.add("None");
but it is not added.I debug and found that radcombobox1.items.IsReadOnly property is true.I also tried to change it to false but it gives error.
Can anybody help me?
I need it in my project.

[Jason Nguyen]

Set the EmptyText property to "None"

[Sagar]

Thanks,I get None on Combo Box.
but I bind Selected text of combo box to textblock,when no record is selected from combo box i want to show "None" on textblock too.

<TextBlock x:Name="TextBlock1" Text="{Binding Text, ElementName=RadComboBox1}" VerticalAlignment="Center" HorizontalAlignment="Left"/>
                                    <telerik:RadComboBox x:Name="RadComboBox1"
                                        Grid.Row="1"
                                        Margin="5"
                                        Width="275"
                                        EmptyText="*None"
                                        VerticalAlignment="Center"
                                        ItemsSource="{Binding Data, ElementName=DomainDataSource1}"
                                        DisplayMemberPath="Desc"
                                        SelectedValuePath="ID"
                                        SelectedValue="{Binding TypeID, Mode=TwoWay}" HorizontalAlignment="Left">
                                    </telerik:RadComboBox>

[Valeri Hristov]

Hi Sagar,

You could bind the TextBlock's Text property through a converter, which will return "None" when the provided value is null or string.Empty.

Sincerely yours,
Valeri Hristov
the Telerik team

[Sagar]

Thanks...
It works fine.