wow ScrollFrame ui

[dust514]

This is my first time using Lua and I try to make the button scroll

I would like to know how to make the button scroll in the ScrollFrame

Sorry, English is not my native language

I hope someone can help me, this confused me for a long time，Thanks

local fk_ui = {}
local backdrop = {
    bgFile = "Interface/BUTTONS/WHITE8X8",
    edgeFile = "Interface/GLUES/Common/Glue-Tooltip-Border",
    tile = true,
    edgeSize = 8,
    tileSize = 8,
    insets = {
        left = 5,
        right = 5,
        top = 5,
        bottom = 5,
    },
}

local f = CreateFrame("Frame", "MyScrollMessageTextFrame", UIParent)
f:SetSize(450, 450)
f:SetPoint("CENTER")
f:SetFrameStrata("BACKGROUND")
f:SetBackdrop(backdrop)
f:SetBackdropColor(0, 0, 0)
f.Close = CreateFrame("Button", "$parentClose", f)
f.Close:SetSize(24, 24)
f.Close:SetPoint("TOPRIGHT")
f.Close:SetNormalTexture("Interface/Buttons/UI-Panel-MinimizeButton-Up")
f.Close:SetPushedTexture("Interface/Buttons/UI-Panel-MinimizeButton-Down")
f.Close:SetHighlightTexture("Interface/Buttons/UI-Panel-MinimizeButton-Highlight", "ADD")
f.Close:SetScript("OnClick", function(self)
    self:GetParent():Hide()
end)

f.SF = CreateFrame("ScrollFrame", "$parent_DF", f, "UIPanelScrollFrameTemplate")
f.SF:SetPoint("TOPLEFT", f, 12, -30)
f.SF:SetPoint("BOTTOMRIGHT", f, -30, 10)

for i = 1,15 do
	fk_ui[i] = "fk_1a"..i
	fk_ui[i] = CreateFrame("Button",fk_ui[i],fk_box,"GameMenuButtonTemplate")
	fk_ui[i]:SetPoint("CENTER",-6,120+(i*-40))
	fk_ui[i]:SetSize(128,35)
end

this is all

I referenced the content here
https://www.wowinterface.com/forums/...50&postcount=2