When the RadCheckBox or RadToggleButton control is clicked quickly, an exception will be thrown: System.NullReferenceException: "Object reference not set to an instance of an object."
private void radCheckBox1_ToggleStateChanged(object sender, Telerik.WinControls.UI.StateChangedEventArgs args){
}
private void radToggleButton1_ToggleStateChanged(object sender, Telerik.WinControls.UI.StateChangedEventArgs args)
{
}
1 Answer, 1 is accepted
Hello,
Yes, there was an issue in the old Q2 2025 version regarding RadCheckBox and RadToggleButton.
This issue is already fixed and is available in our latest Q3 2025 (2025.3.812) version. You can upgrade your project to use 2025.3.812 version and benefit from the fix. With the latest version this issue does not reproduce.
The following article will be useful to upgrade: How to Upgrade Telerik UI for WinForms Project - Telerik UI for WinForms
Regards,
Nadya | Tech Support Engineer
Progress Telerik
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Iron
Iron
There was an issue related to the new UI Automation support that we provide to these components. After you upgrade your project to Q3 2025 version, you should not experience the issue any more.
Regards,
Nadya