databinding formatted text to a richtextbox in silverlight 4 - data-binding

Question

I need to databind formatted text to a RichTextBox. For formatting it seems that I will have to create a series of Runs with their specific formats and then add them to a paragraph and add it to the blocks property on the RichTextBox. I tried to bind a paragraph property to Blocks but it doesn't seem to allow that. Paragraph doesn't have an itemsource to bind it to a list of Runs. How can I possibly databind the list of Runs to a RichTextBox Widget ?
Thanks

Answer 1

Here is the solution I came up with. I created a custom RichTextViewer class and inherited from RichTextBox.
using System.Windows.Documents;
using System.Windows.Markup;
using System.Windows.Media;
namespace System.Windows.Controls
{
public class RichTextViewer : RichTextBox
{
public const string RichTextPropertyName = "RichText";
public static readonly DependencyProperty RichTextProperty =
DependencyProperty.Register(RichTextPropertyName,
typeof (string),
typeof (RichTextBox),
new PropertyMetadata(
new PropertyChangedCallback
(RichTextPropertyChanged)));
public RichTextViewer()
{
IsReadOnly = true;
Background = new SolidColorBrush {Opacity = 0};
BorderThickness = new Thickness(0);
}
public string RichText
{
get { return (string) GetValue(RichTextProperty); }
set { SetValue(RichTextProperty, value); }
}
private static void RichTextPropertyChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs dependencyPropertyChangedEventArgs)
{
((RichTextBox) dependencyObject).Blocks.Add(
XamlReader.Load((string) dependencyPropertyChangedEventArgs.NewValue) as Paragraph);
}
}
}