The issue can be observed in the following dojo example:

https://dojo.telerik.com/OWAyaZuJ

Reproduction of the problem:

1. Open the Dojo.

2. Shrink the window until only a single event is visible. Note: The open() method is called on the last item of the Timeline in the dataBound event.

3. Run the example. The last item of the timeline has been opened, however the "back" button is not active.

Current Behavior:

The "back" button is not active when it should be.

Expected Behavior: 

The button should be active, no matter the screen size.

Environment:

Kendo UI Version: [2021.2.616]

Browser: [all]