I have been trying to get a custom route handler to fire on all of the designers in the back-end of Sitefinity, but I cannot seem to find an appropriate handler for the Forms designer.
I have a handler for pages and template designers (PageEditorRouteHandler and TemplateEditorRouteHandler) working successfully.
Is there any Route handler that specifically handles routing on the Forms designer? Or is there any handler that fires on the forms designer page that I could do filtering on to ensure the page is in design mode?
Also, all official documentation links relating to these handlers seem to come up as 404's, an example here.