TornadFX TreeView cell factory未被调用

my previous question .

class CenterView : View() {
    override val root = TreeView<IStoryItem>()
    init {
        with(root) {
            root = TreeItem(controller.storySet)

            setCellFactory {
                object : StoryEditorCell() {
                    init {
                        System.out.println("Creating StoryEditorCell")
                        onDragDetected = EventHandler {...}
                        onDragOver= EventHandler {...}
                        onDragEntered= EventHandler {...}
                        ...
                    }
                }
            }
            cellFormat { ... }
            populate { ... }
        }
    }
}

setCellFactory 正在调用函数,但由于某种原因 init TreeCell 类型不正确。

TreeView 正确填充,使零件正常工作。为了使电池工厂正常运行,还需要做些什么?