Instructions: Go to Content Definition/Content types and edit the "Page" ContentType. Click on "Add parts". Select the "Layout Selector" checkbox and click save.
This is important!! Name the file Layout-YOURLAYOUTNAME without extension and click on "Save". Otherwise it won´t show up. Select your new layout from the dropdown when you edit a page.
Current release: Added all views in "Parts" folder to list. This let's you edit partials as well.
Previous release: Load file dysfunctional fixed.