Steps to Reproduce

http://zkfiddle.org/sample/2j1psfs/2-ZK-4263

1. Click "Clone by Serialization".
2. Close group "Seafood".
3. Open group "Seafood".

Current Result

1. Close group "Seafood". The icon is like "V".
2. Open group "Seafood". The icon is like ">".

Expected Result

1. Close group "Seafood". The icon should be like ">".
2. Open group "Seafood". The icon should be like "V" and child items are shown.

Debug Information

Workaround