Hello all, I am using umbraco 7.5.4. The umbraco tree holds a questionary which have categories which have pages that the admin can add to the categories. I am using multinode treepicker to choose and add pages to categories. Each page can be added only once to a category. My issue is I would like The admin to know which pages are already been added to the questionary, preferably when the user clicks the picker (which opens the pages list) he should see an indication for the pages that were already been chosen. This ofcourse should be tracked when the user add/delete pages from categories.