The RadNumericBox does not expose dedicated API for controlling its focus. This is why everything you can use is what Microsoft exposed. For example you can use method described in this article
. The only detail that you need to be aware of is you need to ensure that the control is already visualized on the screen in order to attempt focusing it. For example if you try to focus it right after the InitializeComponent() the control most likely will not be focused. It is a good idea to try to focus it after its Loaded event is invoked.
Pavel R. Pavlov
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