Checkbox & keydown [took some time but... RESOLVED!]

[krtxmrtz]

Here's my current (final?) version. I've made a few minor changes (value of row 4) and fixed scrolling problems. I have set the grid width as:

tx = Screen.TwipsPerPixelX
With Grid
    'Sum of the widths of all the columns (all have the same
    ' width) plus the widths of the left and 'right borders 
    '(times 2, found by trial and error)
    .Width = .ColWidth(0) * nVisibleCols + 4 * .BorderStyle * tx
    'And I have added 3 extra pixels (see below)
    .Width = .Width + 3 * tx 
End With

Depending on the total grid width (play around with the number of extra pixels) some problems appear with scrolling. It appears that you need 2 extra pixels so that the rightmost visible column is considered totally visible, but then another pixel may be necessary to prevent unwanted scrolling effects (try and see).
All in all I have the feeling that I'm on shaky ground and that the whole thing is a mess.