How to set focus on Activex Control after postback in aspx page?

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ASP.NET

Im using client side scripting for setting focus on particular control after postback event, Its working properly for HTML controls but its not working for activex control that im having in my project, please suggest some solution. here is code

public static void SetFocus(Control control)
{
    StringBuilder sb = new StringBuilder();
 
    sb.Append("\r\n<script language='JavaScript'>\r\n");
    sb.Append("<!--\r\n"); 
    sb.Append("function SetFocus()\r\n"); 
    sb.Append("{\r\n"); 
    sb.Append("\tdocument.");
 
    Control p = control.Parent;
    while (!(p is System.Web.UI.HtmlControls.HtmlForm)) p = p.Parent; 
 
    sb.Append(p.ClientID);
    sb.Append("['"); 
    sb.Append(control.UniqueID); 
    sb.Append("'].focus();\r\n"); 
    sb.Append("}\r\n"); 
    sb.Append("window.onload = SetFocus;\r\n"); 
    sb.Append("// -->\r\n"); 
    sb.Append("</script>");
 
    control.Page.RegisterClientScriptBlock("SetFocus", sb.ToString());
}