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You can call GameTooltip:AddLine() whenever you want and add text just fine. What you're missing is that you should always call GameTooltip:Show() after adding to it in order to refresh the tooltip, make sure everything is shown that you want, and to make the GameTooltip resize itself to fit your new lines.
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"You'd be surprised how many people violate this simple principle every day of their lives and try to fit square pegs into round holes, ignoring the clear reality that Things Are As They Are." -Benjamin Hoff, The Tao of Pooh
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