Hi Sebastien,
Thank you for writing.
The reported behavior can be considered an issue and I have logged it on our
feedback portal, here:
FIX. RadDock - maximized floating windows should be restored to their Normal window state when started dragging. I have updated your
Telerik points for the report. Additionally, you can subscribe to the item and be updated when its status changes.
As a possible workaround, you can handle the Starting event of the DragDropService and change the WindowState of the dragged window:
I hope this helps. Should you have further questions please do not hesitate to write back.
Regards,
Hristo
Progress Telerik