Hi Ron,
Regarding your first question. To load all items only if the arrow is clicked you may use something like this:
Here on the client we are determining if the arrow is clicked and then send a custom text to the arguments of the
ItemsRequested event, which tells us if we have to return all items.
Regarding the second question. Yes there is no such functionality. According to me you can use combo with footer template to add "Show Previous Results" button. Then you can implement this functionally by yourself.
Regards,
Hristo Valyavicharski
Telerik
Check out the Telerik Platform - the only platform that combines a rich set of UI tools with powerful cloud services to develop web, hybrid and native mobile apps.