The biggest problem I have with Umbraco is extending it with a new Section and Tree (well - not the tree but the html).

My TreeNodeCollection

 protected override TreeNodeCollection GetTreeNodes(string id, FormDataCollection queryStrings)
        {
            var nodes = new TreeNodeCollection();

            var node = CreateTreeNode("1234", id, queryStrings, "Name", "icon-autofill", false);
            nodes.Add(node);

            return nodes;
        }

So my edit.html should be in

App_Plugins/WebshopSection/backoffice/CategoryTree/edit.html

But when I click on the item to edit it Umbraco tells me that

views/CategoryTree/edit.html

does not exits - I cant find a specific rule for where the files should be.