It is normal that when moving from another cell to the cell containing a gird while holding a modifier key will not select the item with the grid cell, since this modifier key is handled by the parent grid, which is holding the selection of the other cell + the grid cell as a whole.
As for the shift-click and Ctrl+shift-click when the cell editor is activated, it works fine on our side. We would need a sample reproducing the issue to be able to investigate that further.
Lastly, the way the selection works in the grid (you can test it in a non-CellEditor grid), works a bit different from Windows Explorer (your description is right), and it is likely not possible to change that, apart from changing the source code of the grid itself.
Imported from legacy forums. Posted by André (had 1984 views)