I'm making a few buttons to ease a few things, and one issue I'm running into is getting one button to cast Unending Breath on my target with left click, and when ALT-clicked to cast it on the player. I've tried a few things from the WoW Wikki, but I cannot seem to figure this bugger out.

So far, what I have working is looking like:

button:SetAttribute("type1, "spell")
button:SetAttribute("spell", "Unending Breath")

But that does not have the right-click to target = player. Any tips?

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Mercy!? You want mercy!? I'm CHAOTIC NEUTRAL!!!

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Q u o t e:
I read this like 6 times, and I'm still confused. =P

 MissButton2:SetAttribute("type", "spell")
 MissButton2:SetAttribute("modifiers", "SELFCAST:self")
 MissButton2:SetAttribute("self-unit", "player")
 MissButton2:SetAttribute("spell", "Unending Breath")

returns an error when left or right clicked:
Interface\FrameXML\SecureTemplates.lua:65: attempt to call global 'ParseModifierString' (a nil value)

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Forwarded to Q/A, thanks!