1. Correct the shapes of the buttons in RadScrollbar's theme OfficeBlack.
2. Rename the current OfficeBlack theme to a name, different than TelerikExamplesBlack.
3. Create OfficeBlack theme:
   - bring the old version of OfficeBlack from main source control stream (checked in with changeset 81190)
   - change the values of the Visibility property from Collapsed to Hidden for all borders in the theme.
4. Use TelerikExamplesBlack theme for the scrollbars in the QSF (instead of OfficeBlack).