Create a Class Group VAF configuration item.

Hello, is there a way to create a VAF configuration item like this so a class group can be set in the M-Files admin?

This results in the error below.

MFClassGroup(Required = true)]
[DataMember]
public MFIdentifier MyClassGroup { get; set; }

Error: Unable to load item. The required editor "MFClassGroupReference" could not be resolved.
at _resolveEditor (/lib/mfiles/propertygrid/PropertyGridWidget.js:890:7)
at Anonymous function (/lib/jquery-ui/jquery-ui.js:415:5)
at _insertItem (/lib/mfiles/propertygrid/PropertyGridWidget.js:630:4)
at Anonymous function (/lib/jquery-ui/jquery-ui.js:415:5)
at renderChildren (/lib/mfiles/propertygrid/PropertyGridWidget.js:1518:6)
at Anonymous function (/lib/jquery-ui/jquery-ui.js:415:5)
at _loadChildren (/lib/mfiles/propertygrid/PropertyGridWidget.js:789:5)
at Anonymous function (/lib/jquery-ui/jquery-ui.js:415:5)
at toggleGroup (/lib/mfiles/propertygrid/PropertyGridWidget.js:1629:6)
at Anonymous function (/lib/jquery-ui/jquery-ui.js:415:5)

Thanks.