Disabling CTRL+Home and CTRL+End

I am trying to disable record movement (under certain conditions). I can disable individual keys, but not the above two combinations.  I would like to keep Home and End working (on their own), as it helps when inside a field.

If pubBoolCallInProgress = True Then
    If KeyCode = 34 Or KeyCode = 33 Or KeyCode = 17 Or KeyCode = 35 Or KeyCode = 36 Then
        DoCmd.CancelEvent
        KeyCode = 0
        Exit Sub
    End If
End If

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Any ideas....