Using Multiple Instances Together
You can use multiple instances of the RichTextBox on the same Silverlight page if required. When you do this you can easily pass data from one instance to another, both programatically and also using the internal, shared clipboard.
Imagine a scenario where you have two RichTextBox instances, one is fully editable and the other is read-only. You want to be able to apply changes to the read-only instance as they occur in the editable instance. For this you can use the ContentChanged event which is triggered when a change is made to the content of a RichTextBox, in the event handler you would then set the RichText property of the read-only instance to the RichText property of the editable instance.