Hi Alexander. Sorry but the Kendo grid does not validate the model before adding a new row, unless the user actually enters the field requiring validation.
It would be nice if it did, that would make things very simple. Here s a JS Bin that demonstrates that fact
. Click Add Row several times.
Even though the Name field is required you get new rows. Then enter the Name field and try to add a row, now you can't without entering some text.