Completed
Last Updated: 17 Nov 2025 07:24 by ADMIN
Jamie
Created on: 13 Nov 2025 18:01
Category: UI for Blazor
Type: Bug Report
0
TabStrip v12.0.0

After upgrading to 12.0.0, the Content does not change when clicking tabs. I always see the Content of the first tab.

My project targets .net8.

4 comments
ADMIN
Dimo
Posted on: 17 Nov 2025 07:24

Hello Jamie,

ActiveTabIndex and ActiveTabIndexChanged are not deprecated yet, but will be in the future. We add such information in the release notes as a breaking change when the API is removed and no longer available. Before that we use at least one release cycle to mark the API as deprecated, which generates build warnings and developers have time to adjust the code.

On a side note, I didn't fully understand what your scenario and implementation are, so I can't comment if there is as bug in the TabStrip or not. I am closing the issue, but feel free to follow-up if you like.

Regards,
Dimo
Progress Telerik

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Jamie
Posted on: 14 Nov 2025 18:57

I see that TabIndex is deprecated. Switching to ActiveTabId has resolved the issue. 

The release notes for v12 do not indicate breaking changes in TabStrip. Maybe this should be added?

Jamie
Posted on: 14 Nov 2025 14:12

The issue occurs when the ActiveTabIndexChanged event handler is used. I can reproduce the issue at blazorrepl.telerik.com

ADMIN
Dimo
Posted on: 14 Nov 2025 10:10

Hello Jamie,

Our TabStrip demos seem to be working as expected, so please provide more instructions on how to reproduce the problem.

If necessary, provide an isolated runnable example.

Regards,
Dimo
Progress Telerik

Love the Telerik and Kendo UI products and believe more people should try them? Invite a fellow developer to become a Progress customer and each of you can get a $50 Amazon gift voucher.