[Tria]

Hi.

Thanks for the replies.

I ended up creating a loader for my addon, that overloads the TradeSkillFrame_LoadUI function like this:

local old_TradeSkillFrame_LoadUI = TradeSkillFrame_LoadUI;
function TradeSkillFrame_LoadUI()
    old_TradeSkillFrame_LoadUI();
    LoadAddOn(<myAddOnName>);
end

And then made my addOn dependent on Blizzard_TradeSkillUI and LoadOnDemand.

This seems to do the trick...