Subgrids with IE8

Hello Forum,
we have a little Problem with subgrids in IE8.

The little plus symbol for the subgris is shown well in Firefox 3.6 but in IE 8 it is not visible.
So the Subgrid can not be openened. (See the screenshot below)

Is there a way to fix it so we can use subgrids in IE8?

We use dhtmlxSuite_v25_pro_91111.

Thanks for your help,

Unfortunately we cannot reproduce this issue at the latest version of dhtmlxGrid. Please check example here … grids.html