[ingeniousclown]

I still prefer the vanilla combobox template, as it doesn't come with an extra label that you may not want:

local dropdown = WINDOW_MANAGER:CreateControlFromVirtual(parent:GetName() .. "DropdownFilter", parent, "ZO_ComboBox")
 
parent.dropdown = dropdown
dropdown:SetHidden(true)
dropdown:SetAnchor(LEFT, self.control, LEFT, 10)
dropdown:SetHeight(24)
if(dropdownWidth) then
    dropdown:SetWidth(dropdownWidth)
end
local comboBox = dropdown.m_comboBox
comboBox:SetSortsItems(false)
 
for _,v in ipairs(callbackTable) do
    comboBox:AddItem(ZO_ComboBox:CreateItemEntry(tooltipSet[v.name], function()
            OnDropdownSelect(v)
        end))
end

A snippit from my Advanced Filters add-on.