Hi Ahmed,
We are constantly improving the accessibility features of all Kendo UI components but I cannot say when this one will be implemented.
I can see that you've voted for the current feature request and this is what you can do to speed-up its implementation. The more votes a given feature request has the bigger the chance for its sooner implementation is. You can follow the current feature request and once there is a change in it status, you will be notified about it.
Regards,
Petar
Progress Telerik