How to add cases to a string

Simply follow these steps:

1. Initial situation
   

   1. - Initial state of the string to be expanded
2. After clicked on the button shown above
   

   2. - The new and uninitialised string-case
3. After filled in the fields
   

   3. - Next step toward the change...
4. After going back -- where is my new string case?!
   

   4. - Where did it disappeared?!
5. It didn't disappeared, just not shown until it's get committed to the SVN
   

   5. - Final suggestions, troubleshooting guide, etc...

Well, it could be argued upon whether the current behaviour is good or not, I'm accepting critics :-)