Thanks for you inquiry. Setting the AccessKey
property for a toolbar button, will allow you to select this button with the keyboard. However, no event will fire in this case. As you already pointed out in the support ticket about this issue, it would make more sense selecting a button with via the keyboard to cause a server-side ItemClick event or any client event to fire. We agree with you and we will provide this functionality as soon as we can. However, we won't be able to implement it for the upcoming service pack 1 on May 15.
the Telerik team