Authors CurseForge

in xml file, defined
<Button name="$parentTestDropDown" inherits="AceGUIAceGUIDropDownTemplate"/>

and in lua file,
TestDropDown = {
type = ACEGUI_DROPDOWN,
title = AceHealConfigLocals.Test,
width = 250,
height = 26,
anchors = {
bottomleft = {relPoint = "bottomleft", xOffset = 15, yOffset = 10}
},
disabled = FALSE,
},

in game the error msg is "has no child 'Selection'"

i am a newbie with ace development, so ask for help here. thx a lot.