Hello,
Referring to your Example Exetnerl Drag&Drop:
https://ej2.syncfusion.com/aspnetcore/Schedule/ExternalDragDrop#/material
There is a way to put your toolTip with HTML content when I mouse hover on a waitinglist Item?
Alternatively, there is another way to put an HTML ToolTIp in that treeview element (waiting list item)?
Many thank's
Regards