wpf - Nested RichTextBox -

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I am creating a small custom scientific editor using RichTextBoxes. The user can insert a 'formula' UserControl in which one Or more rich textboxes, which allows more 'formula' controls to be included - it replicates the minimal functionality of mathematics.

When I insert the user control, it looks OK What's a way to enable the control back in the RichTextBoxes control and enable the control in the Rich Textbox?

Net 3.5 is the solution here:


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