AllowKeyboardNavigation="true" allow for users to navigate the grid with the keyboard. This is great for people with disabilities and Section 508 compliance. But when this is enabled, and the "Enter" key is pressed, the default behavior is to present an update process.
This update process should be controllable when AllowKeyboardNavigation="true".
Just as a user note ... when I was trying to figure this out, reading through the options, the EditMode was the first place I started looking.
Here is the current workaround ... How do I disable editing when AllowKeyboardNavigation="true"? in UI for ASP.NET AJAX Grid - Telerik Forums
Hope this suggestion helps