Last Updated: 15 Aug 2018 13:04 by ADMIN
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).
Last Updated: 04 Aug 2016 09:20 by Nicolas
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. 
Last Updated: 03 Jul 2020 14:59 by ADMIN

An exception is thrown when you try to update the items source of RadTreeListView in an async method.

The following error is observed.
InvalidOperationException: The calling thread cannot access this object because a different thread owns it

To work this around ensure that only the main UI thread updates the item source.

Last Updated: 04 Aug 2016 09:20 by ADMIN
Last Updated: 05 Aug 2016 13:49 by ADMIN
Last Updated: 26 May 2019 20:23 by Buks
Last Updated: 10 Oct 2016 13:46 by ADMIN
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.
Last Updated: 14 Dec 2018 14:43 by ADMIN
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:

Last Updated: 06 Dec 2019 14:20 by ADMIN
Selecting a large number of items through the UI or programatically with the Select method when in Extended SelectionMode leads to a degraded performance. As a workaround the Multiple SelectionMode can be used instead.
Last Updated: 06 Aug 2018 13:26 by Vladimir
Last Updated: 18 Aug 2020 10:20 by ADMIN
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.
Last Updated: 05 Jun 2018 13:37 by ADMIN
Last Updated: 11 Aug 2016 14:04 by Tim Ge
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
Last Updated: 04 Aug 2016 09:21 by ADMIN
Last Updated: 04 Aug 2016 09:20 by ADMIN
Reproducible on http://demos.telerik.com/silverlight/#TreeListView/TreeListViewDragAndDrop