Per the thread at "http://www.telerik.com/forums/isexpandablebinding-requires-user-interaction-with-control-to-take-effect" I have modified the IsExpandedRowBinding sample to recreate the problem. I modified the button to expand and collapse the first row. To reproduce the problem:

1. Expand the first row.
2. Scroll down so the first row is not visible but it's children are visible.
3. Press the button. The expected behavior is the first row should collapse but nothing happens.
4. Scroll up so the first row is visible. The first row collapses.

 

The control does not have a build-in expand/collapse animation. 

We have many use cases where we have multiple panels and we want a tree control (TreeListView or TreeView) to control the contents of the other panels based on selection. Because the selection always happens on MouseDown instead of MouseUp it is impossible to drag & drop items from the tree without changing the selection and thus the contents of the other panels.

When expanding or collapsing an item fast, mouse over effect or expand/collapse appears on a different row. The row needs to be the recycled one. This means that you need to have more items in the viewport and scroll to the bottom for example.

When the IsExpandedBinding property is bound to a custom property, and we use it to collapse and expand specific items, the rows inside the control will disappear.

The Visibility of the DropPossibleIconElement inside the ControlTemplate of the TreeListViewDragCue is not collapsed when the drop is not possible in newer themes. 

Performance is degraded when a large number of columns are added dynamically by binding the Columns collection via an attached behavior.

 

The behavior is reproducible when the TreeLines are visible and we have frozen columns. When the RadTreeListView is scrolled the TreeLines in the Frozen column is also scrolled.

Expose API to allow customizing the appearance of the tree lines.

workaround:
Extract the ControlTemplate for the TreeListViewRow and set the Style explicitly or remove the local Style setter.