Can't programmaticaly set Edge Trigger on MDO3014

I am using the LabVIEW VI called Series Edge Triggered Acquistion Waveform Example, and I cannot programmatically set a triggered (Edge) acquistion if my timebase is larger than 0.020. If I choose a value larger than 0.020, say 0.040, it does an Auto (Untriggered) waveform instead. What is the issue and how can I solve it?

Looks like the Labview vi is not setting trigger to "NORM" and so goes into an untriggered roll mode.