It's possible to create a treeview with a lot of items.
1): Add some items from the main context menu. (see Add Widget ).
2): Right click on the item to show the Properties.
change the caption.
set the tooltip text.
select the icon submenu and select the preferred icon.
select the icon size submenu and select the preferred size.
3): Add a treeview from the main context menu. (see Add Widget ), and drag it into the treeview. For create a tree drag an item into other items of the treeview: