Exporting Ajax Chart Control to Excel

hi, friends,

I am using Asp.net Ajax Chart Control.

it is nice and simple to use, and also easier to manage than normal asp.net chart control.

but I got error when I try to export Ajax chart to excel.

the error is :

Script control 'BarChart1' is not a registered script control. Script controls must be registered using RegisterScriptControl() before calling RegisterScriptDescriptors().
Parameter name: scriptControl

my Ajax Chart id is BarChart1.

I don't know how to register ScriptControl().

in my codebehind, I already wrote already to export GridView.

public override void VerifyRenderingInServerForm(Control control)
    {
        //base.VerifyRenderingInServerForm(control);
        //ScriptManager sm = ScriptManager.GetCurrent(Page);
        //sm.RegisterScriptControl(BarChart1);
    }

I believe this error is what other peoples also have encountered before.

but I still cannot find the solution yet.

regards