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I think i made it!
local f = CreateFrame("Button","TabParty2",nil,"SecureActionButtonTemplate")
f:SetAttribute("type","target")
SecureHandlerWrapScript(f,"OnClick",f,[[
local unit
for i=5,1,-1 do
TabPartyIndex = (TabPartyIndex or 0)%5+1
if TabPartyIndex==5 then
unit = "player"
else
unit = "party"..TabPartyIndex
end
if UnitExists(unit) then
self:SetAttribute("unit",unit)
break
end
end
]])
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