You can download a manual for the Activa 145 here, buttonholing steps would probably be very similar for your model
http://www.bernina.com.au/webautor-data/888/0305295204_0303_a135-a145_EN.pdf
It says you sew one bar, then press the reverse button and the automatic function then sews the bar tacs, other side, bar tack and finishes.
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