Hi Geoff Smith,
Thank you for contacting us.
We are aware of this bug. It will be fixed in our next internal build this Friday. Sorry for any inconvenience caused.
Please, note that the numeric must be focused when you call SelectAll().That is why I suggest you call the Focus() method of the control before calling the SelectAll().
I hope this information helps. I will be glad to assist you further.
All the best,
the Telerik team
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