Text selection won't work

Hi, I'm working with the code demo and I'm trying to implement the text selection without success, I debugged already all the events on my App, and everything is passing to the PDFViewHorz class (tap, double tap, longclick, events are handled), when I set the vSetSelStatus method to true, the selecting rect isn't drawn also, but I'm catching the OnPDFSelectEnd, and when I do the vGetSel() it gives me NULL as result, any clues, tip, info? The java doc isn't too descriptive. I'm using Android BTW.
regards

it is not enable if no license actived.
the demo project downloaded here is actived package name "com.radaee.reader".