Issue Summary

Per the documentation, when configuring the Page Tree macro the Root Page parameter includes special values that can be used - @home, @self, @parent, and @none. 

Currently, when configuring the Page Tree macro only the @home and @self values are available, @parent and @none are not options.

Steps to Reproduce

1. Add the Page Tree macro to a page
2. In the configuration under Root Page select the drop-down menu
3. Only @self and @home are options
4. Try to type in @parent or @none 
5. They are not saved

Expected Results

When configuring the Root Page parameter for the Page Tree macro you should be able to select the following special values: @home, @self, @parent, and @none. 

Actual Results

Only two of the four special values are available: @home and @self

Workaround

Use another macro with similar abilities, for example Child Pages or Page Properties Report, depending on this needs.