[Torhal]

You should have something along these lines:

function DataObj:OnClick(button)
        if button == "RightButton" then
                if IsControlKeyDown() then
                        DoControlStuff()
                else
                        ShowYourTooltip()
                end
        else
                WhateverElse()
        end
end

As the author of LibQTipClick, I should point out that its official forum is here