is-enabled? in radio-box%

Returns #t if the window is enabled when all of its ancestors are enabled, #f otherwise.

• (send a-radio-box is-enabled?) -> boolean

  Returns #f if the entire radio box is disabled, #t otherwise.

  
  

• (send a-radio-box is-enabled? n) -> boolean
     n : exact non-negative integer

  Returns #f if nth radio button is disabled (independent of disabling the entire radio box), #t otherwise. Radio buttons are numbered from 0. If n is equal to or larger than the number of radio buttons in the radio box, an exn:fail:contract exception is raised.