DS is not properly displaying case of group DN

Im not big LDAP expert so I hope this is bug and not my misunderstanding of something LDAP specific feature or something similar.

We have problems with the way DS is working with case of some parts in DN strings. We have some groups in ldap which have DN that look like this:

cn=somegroup,ou=groups,DC=EXT,DC=COM

we need DC in uppercase because of some application and Websphere Application Server rights checking and so these groups are stored with DC in uppercase in LDAP.

Problem with Apache Directory studio is that with such groups it's workjng like it is stored like:

cn=somegroup,ou=groups,dc=EXT,dc=COM

So dc here is converted to lowercase.

DS is displaying it like this, also when I copy DN to clipboard, export ldif etc, Im still getting dc in lowecase.

Even also when Im creating new group and I use existing group as template (and this existing group has DC in uppecase) newly created group is stored with dc in lowercase in ldap.

I dont know if its specific for Tivoli directory server, but my wish is to have DS working with case of DN exactly like it's stored in ldap