Umstellung auf office2007

StandardModule: basMain
Public clrArt As Boolean
Sub ColorPicker()
Dim dlgFarben As DialogSheet
Dim btnOK As Button, btnCancel As Button
Dim optInterior As OptionButton, optFont As OptionButton
Dim txtClr As TextBox
Dim intRow As Integer, intCol As Integer
Dim l As Integer, t As Integer, intClr As Integer
Application.ScreenUpdating = False
Set dlgFarben = DialogSheets.Add
With dlgFarben
.Name = "dlgFarben"
With .DialogFrame
.Top = 0
.Left = 0
.Height = 200
.Width = 170
.Caption = "Color Picker"
End With
l = 15
t = 15
Set optInterior = .OptionButtons.Add(l, t, 75, 15)
optInterior.Caption = "Zellhintergrund"
optInterior.Value = xlOn
Set optFont = .OptionButtons.Add(l + 75, t, 75, 15)
optFont.Caption = "Schriftfarbe"
t = t + 20
For intRow = 1 To 7
l = 15
For intCol = 1 To 8
intClr = intClr + 1
Set txtClr = .TextBoxes.Add(l, t, 16, 16)
With txtClr
.Interior.ColorIndex = intClr
.OnAction = "FarbAuswahl"
.Name = "clr" & intClr
End With
l = l + 18
Next intCol
t = t + 18
Next intRow
Set btnOK = .Buttons(1)
Set btnCancel = .Buttons(2)
btnOK.Top = 180
btnOK.Left = 25
btnCancel.Top = 180
btnCancel.Left = 100
Worksheets(1).Select
.Show
Application.DisplayAlerts = False
.Delete
Application.DisplayAlerts = True
End With
End Sub
Sub FarbAuswahl()
Dim strAc As String
Worksheets("Tabelle1").Select
Application.ScreenUpdating = True
strAc = Application.Caller
If DialogSheets("dlgFarben").OptionButtons(1).Value = xlOn Then
Selection.Interior.ColorIndex = CInt(Right(strAc, Len(strAc) - 3))
Else
Selection.Font.ColorIndex = CInt(Right(strAc, Len(strAc) - 3))
End If
End Sub

Leider nach der Umstellung auf Office 2007 nicht mehr funktioniert.
Meldet bei der Zeile:

Set txtClr = .TextBoxes.Add(l, t, 16, 16)

"Die Add-Eingenschaft des TextBoxes-Objektes kann nicht zugeordnet werden."
Besteht die Möglichkeit den Code zu optimieren oder muss ich auf die Anwendung verzichten?
Bitte um Hilfe.
Gruß Thaddäus