[WIP] Column Chooser Cannot Receive Focus in kendoGridColumnMenuTemplate

[Copilot]

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Original issue description:

Description

The user cannot navigate to the column chooser when it is inside the kendoGridColumnMenuTemplate. The chooser does not receive initial focus when it is the only component in the template. If the sorting column menu is added, it receives focus instead, and the user still cannot navigate to the chooser.

Steps To Reproduce

Open the following example and use the keyboard with Alt/Option + Arrow Down to open the menu on the Name or Price columns. On Name, you cannot reach the chooser using Tab. On Price, you cannot navigate the menu at all, and the focus continues inside the Grid instead.

Screenshots or video

Screen.Recording.2025-09-25.at.9.28.12.mov

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Column Chooser Cannot Receive Focus in kendoGridColumnMenuTemplate</issue_title>
<issue_description>### Description

The user cannot navigate to the column chooser when it is inside the kendoGridColumnMenuTemplate. The chooser does not receive initial focus when it is the only component in the template. If the sorting column menu is added, it receives focus instead, and the user still cannot navigate to the chooser.

Steps To Reproduce

Open the following example and use the keyboard with Alt/Option + Arrow Down to open the menu on the Name or Price columns. On Name, you cannot reach the chooser using Tab. On Price, you cannot navigate the menu at all, and the focus continues inside the Grid instead.

Screenshots or video

https://github.com/user-attachments/assets/9eb3bd83-2949-4b15-a93e-079734542641
</issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #4714

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