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.
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).
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.RadTreeListView.SelectedCells.Clear();
Items are expanded when they match the filtering criteria. Once I added the filterdescriptor, the tree started to expand itself and when I put a break point in RowIsExpandedChanged event handler the treelistviewrow's IsExpanded property is already true Can you have a look at the attached sample application and try to achieve the following: 1. keep the on demand load (so only loadchildren when user clicked on the arrow to expand) 2. apply filter only on the expanded nodes
Reproducible on http://demos.telerik.com/silverlight/#TreeListView/TreeListViewDragAndDrop
As a workaround you can try executing the selection in a Dispatcher with DispatcherPriority.Render. This may not apply in the case when there are many nodes outside the View area.