Hi Dung,
Greetings from Syncfusion support,
At present, we do not have support to indicate whether the button items of the built in toolbar is tapped/selected or not. However, your requirement can be achieved by using custom toolbar instead of built-in toolbar.
Please find the UG link for custom toolbar,
Please find the sample link below,
Kindly share us more details about your requirement and user case scenario to help you with better solution.
Regards,
Muralitharan K