Hello Kelvin,
You can get a reference of the button and increase its badge number using the built-in badge() method.
Here is an example:
http://dojo.telerik.com/OzunU
You can read more about the badge method, here:
http://docs.telerik.com/kendo-ui/api/javascript/mobile/ui/button#methods-badge
Regards,
Kiril Nikolov
Telerik
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