Grid partition not visible in IE8

Hi,

We are using the DHTMLx treegrid in our web application developed in ASP.Net. It is being used in split mode. The partition line is visible in Safari 5.1.7, Mozilla Firefox 6.0.2 and IE9, but it is not visible in IE8. The attached pictures will make it more clearer to understand the issue.



Please note that we are using HTML5 and CSS3 throughout our application, but I guess that should not affect the treegrid’s behaviour as it has its own css and js files.
The version we are using is v.2.6 build 100722.

unfortunately the issue cannot be reproduced locally.
Please, provide us with a complete demo where the issue can be reproduced.
Here you can find a tutorial:
docs.dhtmlx.com/doku.php?id=othe … leted_demo