When I add a new row in grid and let editor open, then copy data of another row(Ctrl+C) to the new-added row((Ctrl+V), the cells with delete buttons all lost there style(css and the scissors disappeared). If you click the delete button in the cell, the delete function could not work. But when rows overflow the grid, the problem will not come out, you'd better set the height of grid is 600 and place less than 8 records in the grid to keep enough place in the grid for the new row.
The screen-shot are as follow:
