Tab "close" button modes.
| Enumerator | 
|---|
| TAB_CLOSE_BUTTON_NONE | There are no "close" buttons on the tabs.  | 
| TAB_CLOSE_BUTTON_ACTIVE | A "close" button is displayed on the active tab only.  | 
| TAB_CLOSE_BUTTON_HIGHLIGHTED_COMPACT | A "close" button is displayed on the active or highlighted tabs only. A space for the highlighted tab "close" button is not reserved.  | 
| TAB_CLOSE_BUTTON_HIGHLIGHTED | A "close" button is displayed on the active or highlighted tabs only.  | 
| TAB_CLOSE_BUTTON_ALL | A "close" button is displayed on all tabs.  |