set-item-label in tab-panel%

Sets the label of a tab by position. Tabs are numbered from 0.

• (send a-tab-panel set-item-label n label) -> string
     n : exact non-negative integer
     label : string (up to 200 characters)

  Set the label for tab n to label. If n is equal to or larger than the number of tabs in the panel, an exn:fail:contract exception is raised.