code: func (l *ListBox) RemoveItem(id int) bool {
  	if id < 0 || id >= len(l.items) {
  		return false
  	}
  
  	l.items = append(l.items[:id], l.items[id+1:]...)
  	return true
  }
docs: // RemoveItem deletes an item which number is id in item list
  // Returns true if item is deleted