Thank you for writing.
I have to confirm that such an issue exists in the current version of our controls. We are going to release an internal build later this week that will contain the fix and you will be able to change the AnimationOrigin of RadScaleAnimation. For now, for a workaround I can propose you to use two animations: one of type RadScaleXAnimation and one of type RadScaleYAnimation. When you set their AnimationOrigin and play them both, the border will be scaled in the top-left corner.
I have updated your Telerik points for reporting this issue. Let me know if you need additional assistance.
the Telerik team
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