Well, its debatable if/or not a Form in a Tab SHOULD "do something" when the user presses <Enter> on a data field
You may not know that if you want this behavior, thats how a Popup window works - and that might solve your issue.
Problem with that is Combo Boxes - because if a user, when arriving on a combo, types some data, arrows to a selection AND THEN presses Enter (thinking he is selecting that option), the Form wants to close (cause its a popup and thats what they do)
In either case, the user can tab into the [Save] button - and use the keyboard. I press a <space> because there once was a Kendo bug where you pushed <enter> on the save button and TWO events went to Aware and the record was saved/created TWICE.
But I don't know how to do what you ask.
J