I was modeling drag-and-drop shape events from this post http://www.java2s.com/Tutorials/Java/JavaFX_How_to/Shape/Handle_Shape_drag_and_drop_events.htm , and I was wondering what might be the best way to reference the type rectangle defined in tornadofx. I know rectangle defined in tornadofx transcribes as a Unit - perhaps I should try to define a type as any rectangle from Shapes.kt in the library?