Hi Piotr,
Thank you for your interest in Syncfusion products.
Are you facing this mentioned issue with Schedule MonthInlineAppointmentTappedArgs in our Essential Studio Volume 2, 2017 (Version 15.2.0.40), if not could you please check with the latest update and let us know with the issue reproducing sample. Since the shared information is not sufficient to replicate the issue, it will be helpful for us to check on it and provide you the better solution.
Regards,
Subburaj Pandian V