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TV_Find(VarText)
{
   Loop
   {
      ItemID := TV_GetNext(ItemID, "Full")
      if not ItemID
         break
      TV_GetText(ItemText, ItemID)
      If (ItemText=VarText)
         Return ItemID
   }
Return
}

; populate your treeview with the key for ItemID and text as value
tv := { base: { add: ObjTV_Add, delete: ObjTV_Delete } }

for k,v in ["one","two","three","four"]
    tv.Add(v)

msgbox % "item 'four' has ItemID == " ObjFind(tv, "four")

ObjFind(obj, text) {
    for k in obj
        if (obj[k] = text)
            return k
}

ObjTV_Add(this, name, ParentItemId = 0, Options = "") {
    this[TV_Add(text, ParentItemId, Options)] := name
}

ObjTV_Delete(this, ItemID) {
    this.remove(ItemID, "")
    TV_Delete(ItemID)
}