RadTreeListView provides two scrolling modes, which allow you to manipulate the type of scrolling. This is controlled by the ScrollMode enumeration property which has the following entries:
RealTime - updates the content in view in real time as the user scrolls.
Deferred - keeps the content in view static until scrolling is complete.
By default the ScrollMode property is set to the RealTime mode.
As RadTreeListView directly inherits the RadGridView it uses its scrolling mechanism. RadGridView allows you to implement programmatic scrolling. To learn more read the Scroll to a particular row or column article in RadGridView's documentation.