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locking unlocking constraints on a sketch

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locking unlocking constraints on a sketch

I am using a great book, Parametric Modeling with Creo Parametric by Randy Shih.

In one section (pg. 4-8), it talks about locking and unlocking constraints on a sketch.

The book tells that by right clicking we can activate lock or unlock given constraints (L1, H, V etc.)

Well, this would be great if I could get it to work, but I don't seem to get the same menu options when I do this.  I also do not see the red circles that the book talks about. 

Is there some setting or version of Creo that doesn't allow this?   I am using  Creo 2.0 academic version.

In general, it would be very nice if there were a way to see the pre-existing constraints on a drawing sketch.  I have never been able to see this until I try to modify a sketch and it give me the violation window, where I then must choose to delete an existing constraint or live with the sketch as is.

Is there any way to see and edit the existing constraints on a sketch?

Thanks.

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