Could you please provide us an information about the exact version of the controls you are currently using?
If you are using a version earlier than R3 2016 the Drop event is expected to not being raised, because internally we are handling it. The reason why are handling the Drop event internally is because it is needed for the Deferred DragDropMode. However, we are glad to inform you that we have mode some improvements in the Docking behavior and currently no DragDrop events are handled internally if the DragDrop is Immediate (the one you are probably using) - thus the Drop method should be called as expected. This changes are available since R3 2016 and are available with the latest official version R1 2017. So, if you are using version earlier than R3 2016 please, upgrade to our latest official release in order to make the events raised as expected.
However, if you are using version higher than R3 2016 and the events are still not raised, please provide us a sample that demonstrates your exact scenario and we will try to provide you with a prompt solution.
Hope the provided information will be helpful for you.
Telerik by Progress
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