code: func (t *Table) SetDoneFunc(handler func(key tcell.Key)) *Table {
  	t.done = handler
  	return t
  }
docs: // SetDoneFunc sets a handler which is called whenever the user presses the
  // Escape, Tab, or Backtab key. If nothing is selected, it is also called when
  // user presses the Enter key (because pressing Enter on a selection triggers
  // the "selected" handler set via SetSelectedFunc()).