Tab-Text
This property defines the title of the page identified by the Tab-Index property.
When values are enclosed between parentheses, the Tab-Index property is ignored, the 1st value refers to the 1st Tab, the 2nd value refers to the 2nd Tab and so on.
 
Example - Modify a Ribbon control to change the tab title
procedure division.
...
  modify screen-1-rbn-1-hdl 
         tab-index 3 tab-text "Ops 3 (disabled)"
...