Imports System.Collections.Generic

Private Shared Function FindControlIterative(ByVal root As Control, _

        ByVal id As String) As Control

        Dim ctl As Control = root

        Dim ctls As LinkedList(Of Control) = New LinkedList(Of Control)

        Do While (ctl IsNot Nothing)

            If ctl.ID = id Then

                Return ctl

            End If

            For Each child As Control In ctl.Controls

                If child.ID = id Then

                    Return child

                End If

                If child.HasControls() Then

                    ctls.AddLast(child)

                End If

            Next

            ctl = ctls.First.Value

            ctls.Remove(ctl)

        Loop

        Return Nothing

End Function