Setfocus In Userform Not Working

I'm having some problems with SetFocus on a user form that I am using. Code is Below.

Dim Answer As Variant
With cboAccount
If .Value "" And .ListIndex = -1 Then
Answer = MsgBox(cboAccount.Value & " is not a registered account, would you like to add it?", vbYesNo)
If Answer = vbYes Then
Load frmNewAccount
frmNewAccount.txtAccountName.Value = frmEnterTransaction.cboAccount.Value
frmNewAccount.Show
If Answer = vbNo Then
cboAccount.SetFocus
End If
End If
End If
End With
End Sub

basically the code asks if the if the answer placed in a cboAccount (combo box) is valid against the list designated to that combo box,

If the entry is not valid a message box appears asking if they would like to add the entry to the valid list if they do not want to do this they can click no and in which case I wan't the focus to be set back to the combo box however currently the setfocus command above does not does not work and the focus is set to the next text box.