I am creating a new section in umbraco.  It's tree loader is largely cloned from the Media tree loader it just loads my own Report Nodes (I have two types, Folders and Reports) instead of Media nodes.  When I right click an item and click Move the move dialog comes up with my tree.  The problem it only allows the leaf nodes to be selected.  When I click on a folder to select it, nothing happens.  The text at the bottom of the dialog does not update and the Ok button remains disabled.  If I select a report node it works fine.

Where do I need to look to resolve this?