Set this attribute to the identifier of a Hollywood brush or icon to add an image
to your treeview node. Whether this attribute expects a Hollywood brush or icon, depends
on what you specify in the Treeviewcolumn.IconType attribute. By default,
Treeviewnode.Icon expects a Hollywood brush. To remove the icon from a tree node,
set this attribute to -1.
Note that RapaGUI might scale the image to fit to the current monitor's DPI
setting. Please read the chapter on high-DPI support for more
information. See High-DPI support for details.
Please also read about RapaGUI's image cache to learn more about icon support in
RapaGUI. See Image cache for details.