GridScreen 1 row landscape, 2 portrait (mixed-aspect-ratio)

I dont know why mixed-aspect-ratio not work correctly.
I try set first row (of gridscreen) with landscape style and second with portrait style.

    port = CreateObject("roMessagePort")   
    screen = CreateObject("roGridScreen")
    screen.SetMessagePort(port)
    rowTitles = CreateObject("roArray", 10, true)
    for j = 0 to 1
        if j = 0 then
            rowTitles.Push("FIRST")
        end if
        if j = 1 then
            rowTitles.Push("SECOND")
        end if
    end for
    screen.SetupLists(rowTitles.Count())
    screen.SetListNames(rowTitles) 
    
    '=========== NOT WORK =========
    screen.SetGridStyle("mixed-aspect-ratio")
    listStyles = ["landscape","portrait"]
    screen.SetListPosterStyles(listStyles)
    '=========== NOT WORK =========

    for j = 0 to 1
        list = CreateObject("roArray", 10, true)
        for i = 0 to 5 
            o = CreateObject("roAssociativeArray")
            o.ContentType = "episode"
            o.Title = "Nome"
            o.Description = "Desc"
            o.StarRating = ""
            o.Length = 5400
            if(j = 0) then 
                o.HDPosterUrl = "pkg:/images/poster_land.png"
                o.SDPosterUrl = "pkg:/images/poster_land.png"
            else
                o.HDPosterUrl = "pkg:/images/poster_port.png"
                o.SDPosterUrl = "pkg:/images/poster_port.png"
            end if
            list.Push(o)
        end for
        screen.SetContentList(j, list) 
    end for