(first screenshot bug1.gif)
Firstly I found it in my project, then looked into the GridDemo and it was there too.
Looks like TwiLightZone to me. Dragging separator between "IPAddress" and "EditButton" out of the black-line region (i.e. dragging to the left) makes vertical line visible.

Visaversa movements shown on the second screenshot (bug2.gif), first column (weeeeryyyy wide) makes all vertical lines disappear.

What to do?
Posted on 2005-10-04 08:48:27 by veach1

Can't reproduce the paint flaw here.

Such paint problems are difficult to track since they often are related to grafixcard / driver.
Try playing around with WS_CLIPCHILDREN and WS_CLIPSIBLINGS styles and see if that helps.

Posted on 2005-10-04 09:45:52 by KetilO

Strange... adding into 25 columns about 15000 empty rows solved the problem,
but creating RAGrid with "WS_CLIPCHILDREN or WS_CLIPSIBLINGS" styles makes it invisible at all.

Anyway, tomorrow I`ll test it on more computers (with different win versions) and `ll see behaveour of vertical lines with 15000 rows containing nonempty cells.
Posted on 2005-10-04 10:05:26 by veach1
Works fine.
No twilightzoning.
My project (25 cols, 15000 rows) vertically scrolls smooth on PI-150Mhz, horisontal scrolling is a liitle bit blinky but it is not a problem.
Posted on 2005-10-05 09:51:29 by veach1