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Unplanned
Last Updated: 06 Jan 2026 14:19 by ADMIN
Simon Störmer
Created on: 06 Jan 2026 13:26
Category: TreeView
Type: Bug Report
1
RadTreeView: Nodes disappear from hieararchy when expanding another node and scroll with mouse wheel

We are experiencing a significant issue with the latest version of Telerik components for WinForms.
The RadTreeView control is affected.
The tree view is populated with nodes.
When nodes are expanded and then scrolled, the +/- indicators are no longer displayed correctly and the elements are also no longer displayed correctly. It even goes so far that no elements are displayed at all (only the root element always seems to remain).

It happens only on environments that we access by remote desktop connection. Never on the local environment till now.

1 comment
ADMIN
Nadya | Tech Support Engineer
Posted on: 06 Jan 2026 14:19

Hi, Simon,

Thank you for reporting this behavior. Currently, the possible workaround to prevent this behaviour is to disable the UI automation in RadTreeView:

treeView1.EnableUIAutomation = false;

Regards,
Nadya | Tech Support Engineer
Progress Telerik

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