Tips Is there any way to lock the screen when in the kindle app?

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http://androidforums.com – I have the same Kindle app on my droid phone, and on the phone, there is a little "lock" icon in the bottom right corner, that keeps the print oriented in one direction, so when you turn your phone, the print doesn't change orientation. I can not figure out how to do this on the Tab. Does anyone have an answer for this? (General)