Hello,

You can use function $find (“spliterID”) and then follow code below:

JS code:

  function Button1_onclick() {
            var spliter = $find("WebSplitter1");
           
            spliter._element.style.height = "100px";
            spliter._element.style.width = "100px";
        }

Also you can take a look samples at:
http://samples.infragistics.com/2008.2/webfeaturebrowser/default.htm

And online documentation at:
http://help.infragistics.com/NetAdvantage/NET/2008.3/CLR3.5/

Hope this helps.

Here are the updated links: Documentation - http://help.infragistics.com/NetAdvantage/ASPNET/2012.1/CLR4.0/ and samples - http://samples.infragistics.com/aspnet/.