Silverlight RichTextBox and UIElementCollection

I am currently trying to implement the Silverlight RadRichText in a user control with the example shown on this RichTextBox example. Using the DataProvider, the code that they are showing is this (sorry for the formatting):

<UserControl x:Class="DataProvidersDemo.MainPage" xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation" xmlns:telerikDocumentsXAML="clr-namespace:Telerik.Windows.Documents.FormatProviders.Xaml;assembly=Telerik.Windows.Documents.FormatProviders.Xaml"> <Grid x:Name="LayoutRoot" Background="White"> <Grid.RowDefinitions> <RowDefinition /> <RowDefinition /> </Grid.RowDefinitions> <telerikDocumentsXAML:XamlDataProvider x:Key="xamlDataProvider" Xaml="{Binding ElementName=radTextBox, Path=Text, Mode=TwoWay}" RichTextBox="{Binding ElementName=radRichTextBo开发者_运维知识库x}" /> <telerik:RadRichTextBox Margin="2" Name="radRichTextBox" /> <TextBox Margin="2" Grid.Row="1" Name="radTextBox" /> </Grid> </UserControl>

and I get that error : A value of type 'XamlDataProvider' cannot be added to a collection or dictionary of type 'UIElementCollection'.

And I don't have a clue where to look anymore

---

<telerikDocumentsXAML:XamlDataProvider x:Key="xamlDataProvider" Xaml="{Binding ElementName=radTextBox, Path=Text, Mode=TwoWay}" RichTextBox="{Binding ElementName=radRichTextBox}" />

needs to be put into your UserControl Resource section.

<UserControl.Resources>
    <telerikDocumentsXAML:XamlDataProvider x:Key="xamlDataProvider" Xaml="{Binding ElementName=radTextBox, Path=Text, Mode=TwoWay}" RichTextBox="{Binding ElementName=radRichTextBox}" />
</UserControl.Resources>