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VirtualTreeview is a treeview control built from ground up.

Its main characteristics are :

  • it is extremely fast. Adding one million nodes takes only ~700 milliseconds
  • very small memory foot print. by only allocating about 60 bytes per node
  • optimized for high speed access. It takes as few as 0.5 seconds to traverse one million nodes
  • Multiselection is supported
  • Drawing the entire tree to a bitmap or the printer is supported
  • fixed background image can be used
  • Hot style for nodes is supported
  • Nodes can have individual heights
  • Sorting via compare callback
  • Support for unicode
  • Multiple columns are supported
  • ... and many more

This component was designed for cross-platform applications.



Author: Mike Lischke
Old LCL Port: Joerg Thaler,Christian Ulrich
New LCL Port: Luiz Américo


LGPL or Mozilla Public Licence 1.1


See the project releases page


you can checkout the actual source from

commandline to do this is

svn co

Bug report / Feature request

Bug Tracker project Lazarus-CCR, category Virtual Treeview

Change Log

  • 20/10/2012 - 4.8.7 LCL R2 - Compatibility with Lazarus 1.0 + 64 bit support
  • 18/02/2011 - 4.8.7 LCL R1 - Sync with 4.8 branch + misc fixes
  • 11/02/2010 - 4.8.6 - First stable release of the new port

Dependencies / System Requirements

Status: Stable Tested on Windows, Linux. Needs testing on MacOS.

Known Issues


  • If new to Lazarus, read Install Packages
  • Extract the LCL Extensions package to a directory (lazarus\components\lclextensions or other of your preference)
  • Extract the Virtual Treeview package to a directory (lazarus\components\virtualtreeview or other of your preference)
  • Open lclextensions_package.lpk in LCL Extensions directory and click "Use / Add to project"
  • Open virtualtreeview_package.lpk in Virtual Treeview and click "Use / Install". Rebuild the IDE


Can be found at VirtualTreeview Main Page (search for help in chm format).

Example code can be found here: VirtualTreeview Example for Lazarus