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If you manage to break your Wagn while messing around with layouts, try adding ?layout=blank to the end of your url.  This will give you access to a functioning, built-in layout

Eg.  http://www.wagn.org/Documentation?layout=blank.


This trick is often most useful in combination with a custom view (eg "edit" or "options").

Eg.  http://www.wagn.org/Documentation?layout=blank&view=edit.


Similarly, you can test layouts before using them by adding "?layout=[layout name]" at the end of most URLs.
_main is just one example of [[contextual names]].