[WxPython] ultimatelistctrl problem

[floatingshed]

More details:
Windows 10 (1607)
Python 3.6.3
wxpython 4.0.0b2

My problem is clearly apparent in the 4.0.0b2 demo, clicking on an item in ultimatelistctrl (report or list view) returns:

Traceback (most recent call last):
File "agw\UltimateVirtualDemo.py", line 87, in OnItemSelected
self.currentItem = event.Index
AttributeError: Index

or:

Traceback (most recent call last):
File "agw\UltimateReportDemo.py", line 802, in OnItemDeselected
self.log.write("OnItemDeselected: %d\n" % evt.Index)
AttributeError: Index
Traceback (most recent call last):
File "agw\UltimateReportDemo.py", line 782, in OnItemSelected
self.currentItem = event.Index
AttributeError: Index

Basically the same error. Help!