FolderBrowserWidget does not fire childSelected event

Hello, I am showing a FolderBrowserWidget in my external javascript application (loading the smartview library and css from my content server installation). The csui docs indicate that the FolderBrowserWidget has an event called childSelected and an accompanying method getSelectedChildren() but after registering these vents to the browder widget instance nothing gets fired. My assumption is that this event should get fired when you're placing checkmarks next to files within smart view but I don't see anything. I also registered a .on("all") event listener, and the only events I've been able to see get fired are containerOpened, defaultActionTaken, and tableRendered but no events related to child items getting selected.

Am I doing something wrong or have I misunderstood the intent behind how these events are supposed to work?

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