Hi Kesem,
We have prepared a simple sample to address your requirement 'To Pick date from SfCalendar as DropDown' through Sample.
Please find the sample in below link in which we have used SfDropDownButton to address your requirement.
we have considered your request as feature and logged report over it. Please visit our website periodically for feature related updates.
Please let us know if you have any queries.
Regards,
Vignesh V