How would one go about doing this?

I've tried adding a property with the same name and adding the EditorDescriptor, UIHint and Ignore attributes, to get programmatic access to the dynamic property, and that works just fine, but I cannot for the life of me understand how to change the editor for that property. Of course, if I remove the Ignore attribute, I get an editor with the correct behavior, but as a page property.

Please advice.