API GameTooltip SetPlayerBuff

Sets a GameTooltip to a player buff of the type last used in GetPlayerBuff. GameTooltip:SetPlayerBuff(buffIndex)

• buffIndex : - The index of the buff to set in the game tooltip (affected by the filter used in )

• It will use whatever the last type of buff you specified in GetPlayerBuff was, hence the reason you should specify GetPlayerBuff right before you call SetPlayerBuff.
• Options for the GetPlayerBuff filter are : HELPFUL|HARMFUL|PASSIVE

Sets the tooltip to the first harmful buff.