API GameTooltip FadeOut

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Initiates fading out of the GameTooltip over the next few seconds.
 GameTooltip:FadeOut()
Note: the game itself does not call this method to fade out the tooltips, although the effect is similar.
== Details ==
Once this method has been called, the GameTooltip will remain at full opacity for one second before fading out over another second and eventually hiding itself. However, if the GameTooltip:Show() method is called while the tooltip is fading out, the fade will be aborted and the tooltip will return to full opacity.
If you must resize a GameTooltip while it is fading and don't want to cancel the fade by calling GameTooltip:Show(), use the following:
 GameTooltip:AppendText( "" )