[Vrul]

Originally Posted by Spyro Didn't know the backdrop borders have parentkeys. Do the corners have parentkeys too? Currently I'm accesing them with GetRegions() lol.

These are the default names:
TopLeftCorner
TopRightCorner
BottomLeftCorner
BottomRightCorner
TopEdge
BottomEdge
LeftEdge
RightEdge
Center

However, the pieces are accessed via:

local function GetNineSlicePiece(container, pieceName)
    if container.GetNineSlicePiece then
        local piece = container:GetNineSlicePiece(pieceName);
        if piece then
            return piece, true;
        end
    end
 
    local piece = container[pieceName];
    if piece then
        return piece, true;
    else
        piece = container:CreateTexture()
        container[pieceName] = piece;
        return piece, false;
    end
end

The only two places I found using GetNineSlicePiece were for Blizzard_BFAMissionUI and Blizzard_CovenantMissionUI which had keys:
TopLeftCorner
TopRightCorner
BotLeftCorner
BotRightCorner
TopBorder
BottomBorder
LeftBorder
RightBorder