Perldata DND in ther wxperl_demo app

[herbert breunung]

cheers

and when im making you busy, then rightious,
that in the topic described function does also not work under linux with
perl 5.12.2 and wxPerl demo version 0.13, (c) 2001-2010 Mattia Barbon
wxPerl 0.9901, wxWidgets 2.8.11

best
herbert