VBA- Variableneingabe über Userform

Private Sub UserForm_Initialize()
With Me.ComboBox1
.AddItem "ActiveWorkbook"
.AddItem "ActiveWorksheet"
.ListIndex = 1
End With
End Sub

Private Sub CommandButton1_Click()

Dim wb_var As String

Dim wb As Workbook

Dim ws As Worksheet

wb_var = ComboBox1.Text

On Error Resume Next

For i = 65 To 66

For j = 65 To 66

For k = 65 To 66

For l = 65 To 66

For m = 65 To 66

For n = 65 To 66

For o = 65 To 66

For p = 65 To 66

For q = 65 To 66

For r = 65 To 66

For s = 65 To 66

For t = 32 To 126

hier ist das Problem, wenn ich aber hier wb oder ws Eingebe, dann wird ja meine  _

Auswahlvariable nicht berücksichitght

wb_var.Unprotect Chr(i) & Chr(j) & Chr(k) & Chr(l) & Chr(m) & _

Chr(n) & Chr(o) & Chr(p) & Chr(q) & Chr(r) & Chr(s) & Chr(t)

Next t

Next s

Next r

Next q

Next p

Next o

Next n

Next m

Next l

Next k

Next j

Next i

MsgBox "Nun müsste es geklappt haben!"

MsgBox "Überprüfe es jetzt mal!"

End Sub