Articulate Presenter 13: How to control the slide lock by SDK

Hi, I write a Flash exercise in Actionscript 3.0 and import to the Articulate Presenter. In the slide setting, I locked the slide. 

Now, I want to do is... after the learner completed the exercise, the slide is unlock and the learner can navigate the slides. In the Articulate 09, I can set something like... 

"_level44.Presentation.Slides[0].Slide[slidenum - 1].navlocked[0]._value = "false";"

But how can I do the same thing in Articulate 13? I checked in the SDK, the SlideLock() property is read-only, so that I can't modify it. Anyone has idea about this problem?

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