[This is preliminary documentation and subject to change.]
The SelectionTree control publishes this event that contains the path for the highlighted item. If the item is selected to run from source, this is the path of the source. If the item is selected to be absent, the string is the AbsentPath string from the UIText Table.
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A Text control on the same modal dialog as the SelectionTree subscribes to this event to display the path of the highlighted item.