Behavior to change layout based on content selected

[nibeck]

I would like to create a behavior that works as follows:

- If an interface file is selected, switch to the "Standard" editor, and show the "Utilities" view
of ano other type of file is selected, show the "Assistant" editor and hide the "Utilities" view.

I don;t think this can be done with the Behavior templates now. Anyone have any ideas?

_mike