Prueba esto y nos cuentas..
Private Sub Text1_KeyUp(KeyCode As Integer, Shift As Integer)
If Shift = 1 And KeyCode = 13 Then Debug.Print "Shift"
If Shift = 2 And KeyCode = 13 Then Debug.Print "Ctrl"
If Shift = 4 And KeyCode = 13 Then Debug.Print "Alt"
If Shift = 6 And KeyCode = 13 Then Debug.Print "Alt Gr"
End Sub