Do you have source code of the control?
This is a change to FlyControlCommon.cs.
Find and replace the following method:
public void Render(HtmlTextWriter writer)
{
FlyDebug.Assert(finalsPreRegistered, 38102);
if (RenderAJAX)
{
using (TextWriter tempWiter = new StringWriter())
{
// render styles to tempWriter (Google Chrome issue workaround)
_stylesRegistrator.RenderStyles(tempWiter);
// render js data
JavascriptBuilder jsBuilder = new JavascriptBuilder();
_stylesRegistrator.RenderEqualsJavascript(jsBuilder);
_control.RenderStartupScript(jsBuilder);
ClientRuntimeLoadRenderer.RenderAJAX(writer, _control.Page.ClientScript, jsBuilder.ToString(), _context);
// redner style to actual writer
writer.Write(@"<style type=""text/css"">");
writer.Write(tempWiter.ToString());
writer.Write("</style>");
}
}
}