I have a form with a tree view on the left and a details form view on the right. When I need to add a new item, I am using a modal window with the appropriate details view embedded in it. This works great for my "add child" action (since there is a separate details view for each level in the tree). I want to also provide the ability for the user to "add sibling", but when the details view is displayed on the right, and I create the modal window with the same details view embedded in it, I get a WebDynpro error saying that an instance of the view already exists. Any ideas on how to avoid this?