Hi Byron,
Thank you for contacting Syncfusion Support.
As of now support to drag and drop items from listbox to SfSchedule is not available in SfSchedule WPF.However, this support for drag and drop items is available in SfSchedule WinRT and UWP platforms.
You can refer the below KB article in WinRT for the same.
https://www.syncfusion.com/kb/2854/how-to-do-a-draganddrop-of-listview-items-into-sfschedule-control Please let us know if you have any query.
Regards,
Swathi G
