Make infragistics' XamRichTextEditor visible to a screen reader

Question

I have an accessibility problem with a rich text control in a clients' WPF project. My client uses the XamRichTextEditor by infragistics, but Microsoft Narrator does not read its contents. I have created a small sample project that has two buttons, a standard text box and the infragistics rich text editor. The sample demonstrates that the screen reader works with all the elements correctly but fails to even recognize the editor.

Our goal is to make the editor control visible to the screen reader, but we are running out of ideas to do so. We have logic in place that attaches the AutomationProperties to the control, and we manually fill them with content as well.

We have contacted infragistics about the matter, but there is not much to be expected in terms of screen reader support for the editor.

Question: Is there any way to mark a control so that it is discovered by a screen reader?

Note: I can't legally upload the infragistics libraries to GitHub, since it isn't freeware. To get the sample to work you have to have infragistics WPF libraries already available on your system, and the existing references must be updated to your local paths. There are also free trial downloads on the infragistics page, but that's a lot to download and install, so I don't particularly recommend doing so.