Is the `ListMenu.activeItem` intended to be re-ass...

# tornadofx

[Carlton Whitehead]

Is the ListMenu.activeItem intended to be re-assigned after an initial assignment? I'm seeing it work the first time, but subsequent assignments appear to have no effect. I stepped through its `activeItemProperty`'s setter when it's receiving a new ListMenuItem, and it's definitely getting called, doing its work, but effects no change on screen.