Bug report

The kendoWindow does not appear on top of the kendoDialog, even when explicitly calling .toFront(). The z-index is not being updated correctly to bring the kendoWindow to the front.

Reproduction of the problem

1. Open the Dojo example - https://dojo.telerik.com/BrnfHeaO

Current behavior

The Dialog is displayed over the Window, although the Window toFront() method is used.

Expected/desired behavior

The kendoWindow (Dialog 2) should appear on top of the kendoDialog (Dialog 1) when opened, similar to the behavior in version 2024.1.130. When .toFront() is called on the kendoWindow, it should update the z-index appropriately and bring the window to the front, displaying it above all other dialogs/windows.

The issue is a regression starting with 2024.1.319

Workaround:

$("#dialog2").parents('.k-window')[0].style['z-index'] = 12000

Dojo - https://dojo.telerik.com/HmQpGqeB

Environment

• Kendo UI version: 2025.4.1111
• Browser: [all]