Ok, I got this working now. It's even more complicated and stupid than I thought.
"type/click" expects a object in "clickbutton". It doesn't work with a frame name. :/
In my secure code PetActionButtonx obv. isn't a valid reference.
So I tried to pre-set a frame reference via unsecure code. Like
Lua Code:
BABHeader:SetFrameRef("PetActionButton1", _G["PetActionButton1"])
Then I tried to use this in my secure code:
Lua Code:
local tbutton = self:GetFrameRef("BABHeader"):GetFrameRef("PetActionButton1")
print(tbutton:GetName())
self:SetAttribute("type2", "click")
self:SetAttribute("clickbutton2", tbutton)
Which printed the string "PetActionButton1" and as a total surprise triggered the error
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6x FrameXML\SecureTemplates.lua:542: attempt to call method "IsForbidden" (a nil value)
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on a right click.
Must be another bug within the secure button stuff (see
http://www.wowinterface.com/forums/s...493#post297493)
Seems as I have to set the clickbutton2/frameref thing via unsecure code. :/