Hi Abubakar,
Thanks for contacting Syncfusion Support.
Popup control is in its preview phase and still in development. We are still analyzing room for improvements, enhancements, needs and requirement from the collective feedback of the users.
We have checked your query and we confirm that the Accept Command is not firing when hitting the ACCEPT button is an issue in our side and we have already fixed the issue internally. The fix for it will be included in our upcoming 2018 Volume 1 Service Pack – 1 release. We appreciate your patience until then.
However, you can refer the below KB for a solution until our Service Pack release. Please be aware that the KB link will be active only till our next Service Pack release.
Regards,
Suhasini