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If you want to achieve drag and drop in gridgroupingcontrol, you need to use DragDrop, DragOver and TableControlMouseDown event. Please refer the below KB for reference and let us know if you have any other concerns.
KB Link :
Thanks and Regards,
Thank you for your update.
We regret for our last update since not mentioned the following details. The drag operation will be started only when we drag the row header area. Also, dragging of record cells won’t perform drag operation. So, if you want to drag and drop the rows from one Grid to another, you have to drag the Row Header of the particular row you want to drop and drop it into the another grid. Please find the attached video for more details.
Please refer the below sample:
Please let me know if you have any other concerns.
Thanks & Regards,