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01-29-13, 05:44 PM   #18
Phanx
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You don't. Your only option with the tag is to unconditionally update it many times per second.

Also, you could easily add a Power bar element to your frame, but give it no dimensions and/or points, thus making it invisible. The only way to run some code when a bar's value changes is to actually have a bar whose value is being changed.
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