Based on discussion https://wpftoolkit.codeplex.com/discussions/483796.
When a collection Property has the ReadOnly attribute to true, it will be faded in the PropertyGrid and user can't see the items in the collection.
Comments: ** Comment from web user: BoucherS **
When a collection Property has the ReadOnly attribute to true, it will be faded in the PropertyGrid and user can't see the items in the collection.
Comments: ** Comment from web user: BoucherS **
Hi,
This will be fixed in v3.4.
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