The purpose of a RichTextBlockOverflow is to display content that does not fit in the bounds of a RichTextBlock or another RichTextBlockOverflow element. This element cannot have direct content; it must get its content from one of the aforementioned elements. Content includes formatted text, hyperlinks, inline images, and other rich content.
Represents a control that displays read-only rich content that has overflowed from another RichTextBlock
or RichTextBlockOverflow
element.