[Xrystal]

It worked great with that little extra change.

The downside is that it must overwrite the font sizes so gonna try and get it run after the addon is loaded and see how different it works. But first screen shot shows it working as follows:

edit:

Well combined your two posts into the following piece of code so that you could create multiple combo boxes ( dropdowns ) in the same Top Level Window.

local wm = WINDOW_MANAGER
local choices1 = {"alpha","beta","gamma","delta","epsilon","zita","ita","theta","iota","kappa","lambda","mu","nu","omicron","pi","rho","sigma","tau","ipsilon","omega"}
local choices2 = {"Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday"}
 
local function CreateTopLevelWindow(name)
    local tlw = wm:CreateTopLevelWindow(name)
    tlw:SetAnchor(CENTER)
    tlw:SetDimensions(200, 50)
    return tlw
end
 
local function CreateDropDown(name,parent,data,selected)
    local combo = wm:CreateControlFromVirtual(parent:GetName()..name,parent,"ZO_StatsDropdownRow")
    combo:SetAnchor(CENTER)
    combo:GetNamedChild("Dropdown"):SetWidth(200)
 
    combo.selected = combo.name
    combo.selected:SetFont("ZoFontGameLarge")
 
    combo.dropdown = combo.dropdown
    combo.dropdown:SetFont("ZoFontGameLarge")
    if selected then combo.dropdown:SetSelectedItem(selected) end
 
    combo.dropdown.OnSelect = function(self,value)
        self:SetSelectedItem(value)
    end
 
    for i = 1,#data do
        local entry = combo.dropdown:CreateItemEntry(data[i],combo.dropdown.OnSelect)
        combo.dropdown:AddItem(entry)
    end
    return combo
end
 
local function AddOnLoaded(eventID,addon)
    if addon ~= "ZO_ComboBoxTest" then return end
    EVENT_MANAGER:UnregisterForEvent(addon,eventID)
    local testTLW = CreateTopLevelWindow("ZO_ComboBoxTest_TLW")
    testTLW:SetDimensions(200,120)  
    local GreekAlphabet = CreateDropDown("GreekAlphabet",testTLW,choices1,"omega")
    GreekAlphabet:SetAnchor(TOP)
    local Weekdays = CreateDropDown("Weekdays",testTLW,choices2,"Sunday")
    Weekdays:SetAnchor(BOTTOM)
end
 
EVENT_MANAGER:RegisterForEvent( "ZO_ComboBoxTest" ,EVENT_ADD_ON_LOADED , AddOnLoaded )

2nd picture shows the 2 together on the screen.

edit 3:
But as you can see, the font still isn't letting you change it for some reason. Maybe you would have to make a template of the template and change the fonts at that point. But no biggie.