Commented Feature: Why modifying an expandable object doesn't not refresh the content in a PropertyGrid? [21685]

Based on CodePLex discussion https://wpftoolkit.codeplex.com/discussions/351469.

If a propertyItem from an expandable PropertyItem is modified, and the parent PropertyItem uses it in its ToString() method, we should update the parent PropertyItem editor to reflect the modification.
Comments: ** Comment from web user: BoucherS **

This will be fixed in v2.7.