I accidentally created this as a discussion here https://wpftoolkit.codeplex.com/discussions/644197 but basically, if you implement ICustomTypeDescriptor as per that discussion, the PropertyGrid will fail to load properly because it uses the wrong object instance.
Comments: ** Comment from web user: BoucherS **
Comments: ** Comment from web user: BoucherS **
Hi,
This will be fixed in v2.9.
Thanks.