Hi Mounir Maghraoui,
I created a simple test page to see if I can reproduce the problem with the latest version of the Telerik.Web.UI assembly (2010.1 415), but to no avail. I have attached my test page and a few images with the result I get with it in different browsers. Could you please open a new support ticket and send me a running project that demonstrates the problem you have?
All the best,
the Telerik team
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