See documentation found at http://www.soft-gems.net/.You can also look at the demos: http://lazarus-ccr.svn.sourceforge.net/viewvc/lazarus-ccr/components/virtualtreeview-unstable/
Are you sure your eyes are OK?There are docs:http://www.soft-gems.net/supplement/download.php?ID=27There's german tutorialhttp://www.delphi-treff.de/tutorials/komponenten/win32/virtualtreeview/English translation:http://www.soft-gems.net/supplement/download.php?ID=78All linked here http://www.soft-gems.net/index.php?option=com_content&task=view&id=12&Itemid=33And this:http://www.szutils.net/VT/VT.php