As discussed in this forum thread
RadRichTextBox does not support collapsible and expandable regions and this functionality cannot be achieved with the current version of the control. Your approach described in the other forum - using InlineUIContainers with RadExpander in them - does not present a viable option due to the following limitations:
1. InlineUIContainers are not resizable and copyable. Thus, there will be no way to achieve a smooth editing experience.
2. Even if you use RadRichTextBoxes in the RadExpanders, the commands from the RibbonUI cannot be made to work with these elements.
3. There are some limitations with the export and import of InlineUIContainers, described in this article
This said, unfortunately the conclusion is that at this point collapse/expand functionality cannot be achieved in RadRichTextBox.
TRY TELERIK'S NEWEST PRODUCT - EQATEC APPLICATION ANALYTICS for WPF.
Learn what features your users use (or don't use) in your application. Know your audience. Target it better. Develop wisely.
Sign up for Free application insights >>