val valueColumn = new TableColumn[Symbol, Symbol] {

            text        = t"ui.cue_metadata_editor.col_val"
            cellFactory = {column =>
                new CustomTableCell[Symbol, Symbol]() {
                    val comboBox = new ComboBox[Option[String]] {
                        editable    = true
                        converter   =
                                StringConverter({string =>
                                                    if(string eq unsetValue) None else Some(string)
                                                },
                                                {
                                                    case Some(str)  => str
                                                    case None       => unsetValue
                                                })
                    }

                    override val delegate = new JFXTableCellUpdateDelegate[Symbol, Symbol] {
                        override def startEdit(): Unit = {
                            text    = null
                            graphic = comboBox
                            comboBox.items.getValue.clear()
                            comboBox.items += unsetValue
                            cueSheet.metaData(item.value) match {
                                case Some(value)    =>
                                    comboBox.items += value
                                    comboBox.selectionModel.select(value)
                                case None           =>
                                    comboBox.selectionModel.select(unsetValue)
                            }
                        }

                        override def cancelEdit(): Unit = {
                            text = cueSheet.metaData(item.value) match {
                                case Some(value)    => value
                                case None           => unsetValue
                            }
                        }

                        override def commitEdit(value: Symbol): Unit = {

                        }
                    }

                    override def updateItem(item: Symbol, empty: Boolean): Unit = empty match {
                        case true =>
                            text    = null
                            graphic = null
                        case false =>
                            text    = cueSheet.metaData(item) match {
                                case Some(value)    => value
                                case None           => unsetValue
                            }
                    }
                }
            }
        }