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what is wrong with this syntax ?

I am getting a javascript error when I put this syntax on aspx page - what is wrong with this  OnClientSelectedIndexChanged='<%# "ShowPercentage(\"" + Container.FindControl("rcbActivityCodes").ClientID + "\",  \"" + Container.FindControl("rntPercentage").ClientID + "\")" %>' ?  
<telerik:RadComboBox ID="rcbActivityCodes"  EnableAjaxSkinRendering="true" runat="server"
                       OnClientSelectedIndexChanged='<%# "ShowPercentage(\"" + Container.FindControl("rcbActivityCodes").ClientID + "\",  \"" + Container.FindControl("rntPercentage").ClientID + "\")" %>' >

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1 Solution
That depends on what that renders to when your page is loaded and/or whether ShowPercentage does not exist and/or what error you get. Can you update with answers to these three questions?
On the telerik controls, you can specify that function.  OnClientSelectedIndexChanged has a specific signature it looks for.  Please see the documentation here

basically all you can do is specify the name of the jabascript method
<telerik:RadComboBox  ID="RadComboBox1"  runat="server" OnClientSelectedIndexChanged="OnClientSelectedIndexChanged" />

The parameter values are set by telerik code
function OnClientSelectedIndexChanged(sender, eventArgs)
 var item = eventArgs.get_item();
 sender.set_text("You selected " + item.get_text());
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