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How do i specify only specific region in which the node can be dragged ? Tried with boundary constraints but there is some issue with it in blazor 

 152070.Tried to do using diagram events ,but allowdrop= false is not working and 
cancel= true is setting the node to original position


  public void OnPositionChange(IBlazorDraggingEventArgs args)


  double newX = args.NewValue.OffsetX.GetValueOrDefault();

        double newY = args.NewValue.OffsetY.GetValueOrDefault();

        if(newX < 0 || newY < 0)


            //args.Cancel = true;

            args.AllowDrop = false;