Component Combobox Actionscript 3 on Animate CC2017

If you add only combobox component on AnimateCC 2017 you get this error:

Error:
TypeError: Error #1009: Cannot access a property or method of a null object reference.
    at fl.containers::BaseScrollPane/drawBackground()
    at fl.controls::List/draw()
    at fl.core::UIComponent/drawNow()
    at fl.controls::List/scrollToIndex()
    at fl.controls::SelectableList/scrollToSelected()
    at fl.controls::ComboBox/open()
    at fl.controls::ComboBox/onToggleListVisibility()

Solution: Add to the library the List Component to, and you can see thats work.
Test:
combobox.fla