The horizontal scrollbar of RadTreeListView is displayed even the setup suggest that it should not be. For example, this happens if you have a single column with its Width set to * which means that the RadGridView should span in the available space without the need of displaying a horizontal scrollbar. To recreate this the RowIndicatorVisibility property should be set to Collapsed. Additional to that there should be a hierarchy and the items should be expanded.

To work this around, you can set a fixed Width for the column. If you want this to be dynamic you can calculate the width on SizeChanged of RadTreeListView

 

By default the AutoExpandItemsAfterFilter property of RadTreeListView is set to True, which means that when you filter the data, the parents of all found child items will be expanded automatically. However, if you call the CollapseAllHierarchyItems method this functionality stops working.

To work this around, you can reset the ItemsSource property instead of using the CollapseAllHierarchyItems.

 

The gray background that is shown when you hover an item is not hidden when the pointer leaves the item. That happens when you scroll on a touch device. 

To work this around, you can hide the pointer over background completely. To do this, you can edit the ControlTemplate of RadListView item and remove the Setter from the PointerOver Visual State.

Currently, the Shift + click action (when SelectionMode is Extended) selects only the expanded items. Any child items that are in the collapsed items collection of a node won't get selected.

Add a mechanism to allow this type of selection. It can be built-in or some events or method overrides can be introduceds in order to be bale to easily interfere and customize the extended selection.

When dragging and dropping an item, to get the current item's place in the collection you would need to either use the underlying collection bound to the ItemsSource property or get it via reflection. Instead, change the ParentView and RootView properties of the HierarchicalChildCollectionView, to public, to not use the reflection approach. 

If you move an item from one level to another into the tree, the indent of the corresponding row won't get updated. This is reproducible only if the new parent of the moved item is expanded, while the operation is executed.

Usually, this can be reproduced by calling the ExpandHierarchyItem() for the new parent item method just after the moving of the original item.

To resolve this you can delay the expanding of the item. Note that the expanding is executed manually by calling the ExpandHierarchyItem() method. So, you can use a dispatcher with a lower DispatcherPriority to delay this.

Or alternatively, you can collapse the item before expanding it (using the CollapseHierarchyItem() method).

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.

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

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

Add a mechanism that allows you to sort each child level separately. For example, by applying a different sort descriptor to each child hierarchical view collection.

 

Research a possible way to improve the expanding performance of TreeListViewRow.

Sometimes the cells from more than one row are copied even though the SelectionMode is Single. As a workaround, you can clear the SelectedCells collection of the control in the Copied event: