number-of-visible-items in list-box%
Returns the maximum number of items in the list box that are visible
to the user with the control's current size (rounding down if the
exact answer is fractional, but returning at least 1).
number-of-visible-items in list-box%
Returns the maximum number of items in the list box that are visible
to the user with the control's current size (rounding down if the
exact answer is fractional, but returning at least 1).