Docs should default to showing API for selected component, and not the hierarchy.

The docs for a given class shows the configs, methods, and event for the selected class, and for classes up the inheritance hierarchy. But users are most interested in the members introduced by the class.

Every time I look up a class, one of the first things I do is de-select the ancestor classes. It would be a lot easier to start with the current class alone -- if needed, the user is still free to select classes up the hierarchy.