This is my day for stupid questions (you can see that I'm getting around to trying this out).

I really like the Chord Builder window -- it alone is great for composing for those of us who are instrument challenged -- but once I've clicked on an extension I can't get rid of it. IOW, I just want to hear an "F" chord, but if I have the Maj extension clicked there is no way to clear it that I can find. I can choose *another* extension, I just can't get back to a simple chord. What am I missing?