keyboard navigation on initial load

I am having a minor problem getting the keyboard up/down arrows to navigate the grid rows when the page is first loaded. I am using selectRow(0) so the first row is selected by default. If I click on that row or any other row then keyboard navigation works so I am not sure why its not working initially when a row is selected. I am not sure how to tell if another object has focus such as the layout tabs or toolbar at first load.

Unfortunately the issue cannot be reproduced locally. Please, provide with a complete demo, where the issue can be reconstructed.
Here you can find a tutorial: … leted_demo