looping through controls - for each ... next

If the user checks selects 'Yes' from a combo box, I'd like to enable
a group of check boxes (all have tag property "col"). If the user
selects 'No', I'd like to disable them but, if any are checked, tell
the user data will be deleted and then set the checkboxes = Null
(assuming the user says okay). My current code triggers the prompt for
*each* check box that's checked, rather then looping through them
automatically. Do I need to another "For each ..." clause after the
first Else statement?

###

Private Sub cboColor_AfterUpdate()

For Each ctl In Me
If ctl.Tag = "col" Then
If Me.cboColor.Value = "Yes" Then
ctl.Enabled = True
Else
If ctl.Value = False Then 'nothing has been checked;
disable the controls
ctl.Enabled = False
Else 'something has been checked; tell user it will be
deleted
iresponse = MsgBox("Changing this from Yes will delete
the information in the " & _
"related fields." & _
Chr(13) & Chr(13) & "Continue?", 4 + 48 + 256, "Delete
confirmation")
If iresponse = 7 Then ' user said
No
Me.cboColor.Value = "Yes"
Exit Sub
Else ' user said Yes
ctl.Value = Null
ctl.Enabled = False
End If
End If
End If
End If
Next
Set ctl = Nothing

End Sub

###

Thank you.