Function PopupMenu.setItemAsCheckable

Sets whether the item at index idx has a checkbox. If false, sets the type of the item to plain text. Note: Checkable items just display a checkmark, but don't have any built-in checking behavior and must be checked/unchecked manually.

void setItemAsCheckable (
  const(long) idx,
  const(bool) enable
) nothrow @nogc;