[gmarco]

Thanks again for you replies.

I think I have added the Settext ...
I packed your code in a simple addon so we can test better.

The code is:

local NUM_BUTTONS = 8
local BUTTON_HEIGHT = 20
 
local list = {"aaaa","bbbbb","cccccc","ddddddd","eeeeee","ffffff","gggggg","hhhhh"}
local buttons = {}
 
local function update(self)
    local numItems = #list
    print ("DEBUG: nr. items " .. numItems)
    FauxScrollFrame_Update(self, numItems, NUM_BUTTONS, BUTTON_HEIGHT)
    local offset = FauxScrollFrame_GetOffset(self)
    for line = 1, NUM_BUTTONS do
        local lineplusoffset = line + offset
        local button = buttons[line]
        if lineplusoffset > numItems then
            button:Hide()
        else
            button:SetText(list[lineplusoffset])
            button:Show()
        end
    end
end
 
local scrollFrame = CreateFrame("ScrollFrame", "MyFirstNotReallyScrollFrame", UIParent, "FauxScrollFrameTemplate")
scrollFrame:SetScript("OnVerticalScroll", function(self, offset)
    FauxScrollFrame_OnVerticalScroll(self, offset, BUTTON_HEIGHT, update)
end)
 
for i = 1, NUM_BUTTONS do
    local button = CreateFrame("Button", nil, scrollFrame:GetParent())
    if i == 1 then
        button:SetPoint("TOP", scrollFrame)
    else
        button:SetPoint("TOP", buttons[i - 1], "BOTTOM")
    end
    button:SetSize(96, BUTTON_HEIGHT)
    button:SetText(list[i])
    buttons[i] = button
end
 
print ("DEBUG: Force updating")
update(scrollFrame)

I attach also the zip file of the addon directory.

Thanks again.