The Native NumericTextBox doesn't have the 'k-state-focused' class applied to it, once the component is focused. 

For comparison, the Angular and React versions of the same component get this class applied.

React: https://www.telerik.com/kendo-react-ui/components/inputs/numerictextbox/ 

Angular: https://www.telerik.com/kendo-angular-ui/components/inputs/numerictextbox/