Tab Header Title Resizes Uncontrollably

[Josepth Badrouk]

If there are three or more tabs in a tab control, and the second one is selected, and the window width becomes too small, the tab will start resizing uncontrollably. I've attached a recording of the issue.

Attachment: tabissue_72ec2292.zip

[Karthick Arjunan]

Hi Josepth Badrouk,

We have confirmed the reported scenario is a defect and logged a report for the reported scenario, “TabItemExt header flickers during window resize”. We will fix this issue and include it in our NuGet release which is scheduled for 16th December 2025.

 

You can track the status of this defect using the following feedback link: TabItemExt header flickers during window resize in WPF | Feedback Portal

 

Please let us know if you need any further assistance.

Note: The provided feedback link is private, and you need to log in to view this feedback.

 

Disclaimer: “Inclusion of this solution in the weekly release may change due to other factors including but not limited to QA checks and works reprioritization.”

Regards,
Karthick Arjunan

[Karthick Arjunan]

Hi Josepth Badrouk,

We sincerely apologize for the inconvenience caused.

The reported issue has been resolved. However, due to additional testing requirements, we were unable to include the fix in the latest 2025 Volume 4 main release (v32.1.19). The fix will be included in our upcoming weekly NuGet release which is scheduled for 23rd December 2025. We appreciate your patience until then.

Regards,
Karthick Arjunan

[Karthick Arjunan]

Hi Josepth Badrouk,

We have included the fix for the reported issue “TabItemExt header flickers during window resize” in our Weekly NuGet release version 32.1.20 which is available for download (https://www.nuget.org/).

Root Cause: The flickering occurred because when scrollOffset is set to zero (selected tab exactly aligned with the viewport), which applies an unnecessary scroll adjustment. This triggered repeated layout recalculations during window resize, causing the selected tab to flicker.

We thank you for your support and appreciate your patience in waiting for this update. Please get in touch with us if you require any further assistance.

Regards,

Karthick Arjunan