lazarus/examples/Components/vst_advanced
..
Res
Advanced.ico
Advanced.lpi
Advanced.lpr
Advanced.res
AlignDemo.lfm
AlignDemo.pas
bitmap.lrs
DrawTreeDemo.lfm
DrawTreeDemo.pas
Editors.pas
ExtraRes.rc
extraresources.res
GeneralAbilitiesDemo.lfm
GeneralAbilitiesDemo.pas
GridDemo.lfm
GridDemo.pas
HeaderCustomDrawDemo.lfm
HeaderCustomDrawDemo.pas
Main.lfm
Main.pas
mainicon.ico
MultilineDemo.lfm
MultilineDemo.pas
PropertiesDemo.lfm
PropertiesDemo.pas
readme.txt
shlobjext.pas
SpeedDemo.lfm
SpeedDemo.pas
States.lfm
States.pas
unicode.lrs
VisibilityDemo.lfm
VisibilityDemo.pas
vst_advanced.ex-meta
WindowsXPStyleDemo.lfm
WindowsXPStyleDemo.pas

These are some of the "official" VirtualTreeView demo projects ported to and optimized for Lazarus. 
More samples can be found at https://github.com/blikblum/VirtualTreeView-Lazarus/tree/lazarus-v5/Demos.