[Kentarii]

Another one, just to give you more to choose from:

--- Add a tooltip to a control.
-- @param ctrl the control element.
-- @param text the text to show on mouse over.
-- @return void
local function SetToolTip(ctrl, text)
    ctrl:SetHandler("OnMouseEnter", function(self)
        ZO_Tooltips_ShowTextTooltip(self, TOP, text)
    end)
    ctrl:SetHandler("OnMouseExit", function(self)
        ZO_Tooltips_HideTextTooltip()
    end)
end