The kendo grid's keyboard navigation does not work reliably when rendering a grid inside a dialog. I assume that this is caused by the dialog's focus trap.

To reproduce the issues, open this DOJO that just renders a grid in a dialog.

1. open the dialog
2. focus the "Add" button
3. press TAB until the focus is on the first cell
4. press ARROW DOWN (this focuses the checkbox in the cell below)
5. press TAB

-> the close button of the dialog is focused

Also note that after reloading the DOJO and doing this for the first time, step 3 directly focuses the checkbox while in consecutive runs, the cell is focused.