To reproduce: public Form1() { InitializeComponent(); for (int i = 0; i < 10; i++) { this.radGridView1.Columns.Add("Col"+i); } this.radGridView1.TableElement.RowDragHint = null; } Workaround: public Form1() { InitializeComponent(); for (int i = 0; i < 10; i++) { this.radGridView1.Columns.Add("Col"+i); } this.radGridView1.TableElement.RowDragHint = null; CustomRadGridViewDragDropService service = new CustomRadGridViewDragDropService(this.radGridView1.GridViewElement); this.radGridView1.GridViewElement.RegisterService(service); } public class CustomRadGridViewDragDropService : RadGridViewDragDropService { public CustomRadGridViewDragDropService(RadGridViewElement gridViewElement) : base(gridViewElement) { } public override string Name { get { return typeof(RadGridViewDragDropService).Name; } } protected override void PrepareDragHint(ISupportDrop dropTarget) { if (this.GridViewElement.TableElement.RowDragHint == null) { return; } base.PrepareDragHint(dropTarget); } protected override IGridDragDropBehavior GetDragDropBehavior() { IGridDragDropBehavior behavior = null; ISupportDrop dropTarget = this.DropTarget; if (dropTarget is GridHeaderCellElement) { behavior = new CustomGridColumnDragDropBehvavior(); return behavior; } return base.GetDragDropBehavior(); } } public class CustomGridColumnDragDropBehvavior : GridColumnDragDropBehvavior { public override Size GetDragHintSize(ISupportDrop dropTarget) { if (this.DragHint==null) { return new Size(0, 0); } return base.GetDragHintSize(dropTarget); } }