EXS 24 Logic Sampler Users Group

OK....I think I should be embarrassed about this.  I've been using 
Logic for years so I'm certain I should know about this....but.  
Yesterday I was working with some pieces of audio files in the arrange 
window.  I did some kind of keyboard command....I haven't been able to 
duplicate it....and the audio files in that track turned blue.  
Well....I don't mind blue....but it makes it impossible to edit the 
files in the arrange window.  It seems to allow me to program 
automation for individual pieces of audio files...that's nice...but I 
don't need to do that right now.  Please tell me what function I've 
enabled and how to turn it off.  Thanks a bunch

sheepishly,
julie