You can customize the control used in the summary area by setting PropertyGrid.SummaryTemplate to a custom DataTemplate. You can even take the default DataTemplate, which currently uses TextBlocks, and tweak it to your needs (such as replacing the description TextBlock with an RichTextBox).
In any event, we've marked down your request to add default support for this type of feature.
Actipro Software Support
The latest build of this product (v22.1.4) was released 2 months ago,
which was after the last post in this thread.
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