Loading File Tools file tree asynchronously (v 2.3)

My elgg 2.3 site loads widgets from a menu without refreshing the page.  I rebuilt the FileTools filerepo widget to include the file_tree.

Can you tell me what I need to do in order to load the jsTree in File Tools without a page load? I (think I) understand that the view "list/tree" instantiates the tree using "elgg_require_js('file_tools/tree');" and it works fine when the tree loads during a full refresh.  When I remove and reload the widget, the tree is not instantiated.

I realize that Composer loads bower-asset/jstree as a required dependency during page load.  I am not clear how to load jstree without a page load.

Thank you