When a table is created with a lot of rows, a large number of which are hidden (by setting the height to 0) an attached vertical scrollbar cannot be moved by dragging the slider.
When the border width is 0 this does not work at all, with a border width of 1 it is possible to drag to the end of the list.
Email: neil@hamptonsoftware.co.uk
This has been found on Windows XP with Tktable 2.9 and ActiveTcl 8.4.14
Example script