We have threads going on around here about why tabs/panels are constantly added to a tile instead of replacing one. I've gotten accustomed to expecting a new panel in my tiles whenever I click a link. I think I'm one of the few who actually like adding resources to my desktop instead of replacing them (You should see my real desk)...
This is why I was just shocked to use the Equivalent Resources Button (
) in my NA27, Click the Lexham Clausal Outlines... and it replaced my NA27! But wait, I wanted them both open! 