Front Panel Lights

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I just got my incredible a few days ago. I'm also an android newbie. What's the logic of the front panel nav button lights? As they are flush I would like the lights on in most situations. They seem to come on at random times with no discernable pattern. Any logic here? Any way to control this?
Thanks for such an awesome forum and site. XDA-Dev rocks!

Admin- sorry for the redundant post. I thought my original didn't post and didn't see it on forum out listed in my cp. Please delete this thread.