Silverlight 4 Beta includes a new RichTextArea control. RichTextArea enables you to display or edit rich content and has features like:

• displaying hyperlinks
• displaying inline images or other UIElements like a Button
• Read-only mode
• Selection APIs
• Formatting text at run time

Creating a RichTextArea is  simple, it is similar to creating any other control in Silverlight. You can set content in a RichTextArea using the Paragraph element (the content property itself is Blocks, which in turn is a collection of Paragraph elements).

Here’s some sample code that shows you how to create a RichTextArea with a paragraph and some bold text.

<RichTextArea VerticalScrollBarVisibility="Auto">

<Paragraph> A RichTextArea with <Bold>initial content</Bold> in it. </Paragraph>

</RichTextArea>

Here’s the C# code, which does the same thing as the above xaml.

private void ContentRTA()

{

//Create a new RichTextArea with its VerticalScrollBarVisibility property set to Auto.

RichTextArea MyRTA = new RichTextArea();

MyRTA.VerticalScrollBarVisibility = ScrollBarVisibility.Auto;

// Create a Run of plain text and some bold text.

Run myRun1 = new Run();

myRun1.Text = "A RichTextArea with ";

Bold myBold = new Bold();

myBold.Inlines.Add("initial content ");

Run myRun2 = new Run();

myRun2.Text = "in it.";

// Create a paragraph and add the Run and Bold to it.

Paragraph myParagraph = new Paragraph();

myParagraph.Inlines.Add(myRun1);

myParagraph.Inlines.Add(myBold);

myParagraph.Inlines.Add(myRun2);

// Add the paragraph to the RichTextArea.

MyRTA.Blocks.Add(myParagraph);

//Add the RichTextArea to the StackPanel.

MySP.Children.Add(MyRTA);

}

For more details , samples and VB code see RichTextArea reference and the RichTextArea Overview topics.

-Nitya.