How can I drag/drop nodes within a treeview, but block the drop (or change the destination index) for some locations.

I have a treeview which is used to manage job scheduling set up with the level 0 nodes being foremen and level 1 nodes as jobs.
The job nodes at the top of the list for each foreman have a custom attribute on them to denote that it is started and they are not draggable.  I need to either block dropping the unstarted jobs in the middle of the started ones or change the destination index to the first one after the last started job.

Hi zAxis,

I have attached a sample page with a simple drag and drop between two RadTreeViews as well as comments where you would need to implement the check if the node can be dropped or not. Here you can read more about client-side events of the RadTreeView. 

All the best,
Kate
the Telerik team