ExcelBanter - Help with code issues

Again I'm posting this.
Can someone please help me with an issue I am having with some code. When I
use the code for testing it works just fine, however when I apply it to the
whole macro code it does not work properly, any suggestions would help.
Thank you all

Here is the code in the test form

Private Sub Cbo1_Change()
Dim S As String
Dim V As Variant
Dim R As Range
S = Me.Cbo1.Text
V = Application.Match(S, Worksheets("sheet1").Range("A1:A10"), 0)
If IsError(V) = True Then
frm1.Hide
frm2.Show
End If
If IsError(V) = False Then
With Me.Cbo2
For Each R In Worksheets("test").Range("A1:A17")
If R.Text = S Then
.AddItem R(1, 2)
End If
Next R
.SetFocus
If .ListCount 0 Then
.ListIndex = 0
End If
End With
End If
End Sub

Private Sub UserForm_Initialize()
Cbo1.List = Sheets("sheet1").Range("A1:A6").Value
If Cbo1.Value = "" Then
frm1.Hide
frm2.Show
End If
End Sub

Here is the code when it is applied to my macro(it does not work)

Private Sub CbxMfg_Change()
Dim S As String
Dim V As Variant
Dim R As Range
S = Me.CbxMfg.Text
V = Application.Match(S, Worksheets("MANCODE").Range("A2:A1000"), 0)
If IsError(V) = True Then
FrmProduct.Hide
FrmManu.Show
End If
If IsError(V) = False Then
With Me.CbxProd
.Clear
For Each R In Worksheets("ProCode").Range("A2:A1000")
If R.Text = S Then
.AddItem R(1, 2)
End If
Next R
.SetFocus
If .ListCount 0 Then
.ListIndex = 0
End If
End With
End If

End Sub

Private Sub UserForm_Initialize()
CbxMfg.RowSource =
Worksheets("MANCODE").Range("A2:A1000").Address(ex ternal:=True)
CboFire.RowSource =
Worksheets("Lists").Range("D2:D5").Address(externa l:=True)
CboHealth.RowSource =
Worksheets("Lists").Range("D2:D5").Address(externa l:=True)
CboReact.RowSource =
Worksheets("Lists").Range("D2:D5").Address(externa l:=True)
CboDisp.RowSource =
Worksheets("Lists").Range("E2:E4").Address(externa l:=True)
CboDept.RowSource =
Worksheets("Lists").Range("C2:C10").Address(extern al:=True)

End Sub