DDEX Provider : VS 2015: Server Explorer : Null reference Exception when updating value via Advanced Property of Connection dialog box

We develop DDEX provider for IBM DB2. With Visual Studio 2015 we could observe NULL reference exceptions when Connection is expanded in Server Explorer and User try to update value (for example Schema List) via Advanced Property of Connection dialog box.

This issue we could only observe in Visual Studio 2015.

1. Is there any change with VS 2015 in Server Explorer code ?

2. For DDEX provider what should be definition\property for roottype element in SQLObejctSupport.xml ?