It would be useful to add resize to content support for a grid column.
 
Also, resizing has the following issues:
1) The last column is difficult to resize as the right resize cursor is not visible after you reduce its size the first time
2) If you reduce the size of the last column, the background of the grid area is displayed. This is not ideal, it would be better if the row style (e.g. alternating) fills the empty space (add an empty column?)

Thanks!
Giuseppe