Change in pythonCard multipleChoiceDialog between WxPython unicode versions 2.6 and 2.8 on XP

While migrating from WxPython 2.6 to 2.8 noticed a difference between
the pythonCard dialog.multipleChoiceDialog.

Using WxPython 2.6, the pythonCard multipleChoiceDialog would allow
multiple choices as well as quickly selecting all items by using
keyboard and Shift keys.  The WxPython 2.6 dialog did not display a
checkbox next to each item either.

Using WxPython 2.8, checkboxes are displayed next to each item and there
was no way using the keyboard to select all the items in the
multipleChoiceDialog.  Since there are a large number of selections
where at times I need to select all of them, the older way of selection
(w/o checkboxes) is preferred.

Any clue as to what changed or how I can get the 2.6 version behavior
back?

Thanks.

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