VBA code to refresh form data with out clicking button

I am an access beginner so please excuse simple question.

I can refresh my form data by having a button on the form generated by a wizard. This works fine and has the code:

Private Sub Command12_Click()
On Error GoTo Err_Command12_Click


    DoCmd.DoMenuItem acFormBar, acRecordsMenu, 5, , acMenuVer70

Exit_Command12_Click:
    Exit Sub

Err_Command12_Click:
    MsgBox Err.description
    Resume Exit_Command12_Click
   
End Sub

I want to get the same effect by using code on the enter property of a field so the form is automatically refreshed when the user selects the field.

please could I have the code to do this?