When you have a very long list of items to display in the tree view its not always ideal to have a vertical scroll.  In order to better utilize space and allow for the user to see more options on the screen at once it would be nice to have a configuration to allow for the list to be split up into columns.  So for example if you have a list of 90 items, you can maybe have 3 columns of 30 items each.  Please see the attached image that demonstrates what I am referring too.  

The Kendo Silverlight does have something similar: https://docs.telerik.com/devtools/silverlight/controls/radtreeview/how-to/create-horizontal-treeview