Originally Posted by SDPhantom
It's an old XML feature that made its way over to the Lua implementation of creating frames. Adding $parent to the beginning of a frame name tells WoW to take the name of the parent frame and insert it there. In this case, it's a direct replacement for the line you had before and ends up giving it the same name. It may work in Frame:SetPoint() too, but nobody ever uses it for that since it's better to use a frame pointer anyway.
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Sounds interesting
Maybe I should have a look at XML in close future!
Thank you for explanation
