Do you experience the problem on our demos
too? If the problem is reproducible in your application only, please make sure that you are using XHTML-compliant doctype
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
and if this doesn't help, open a support ticket and send a sample project where this issue can be observed. We will check it and do our best to help.
the Telerik team
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