Write a function in design side in Javascript which takes the hardcoded id of that control which you wants to make invisible.
and from the codebehind call that function with your desired id.
like from code behind.
if(value)
{
ScriptManager.RegisterStartupScript(this.Page, this.GetType(), "blah", "makeInvisible('" + parm + "');", true);
}
here
param
is the parameter in which you have to pass radiobutton id as parameter, and
makeInvisible()
is the Javascript function which will take Radiobutton id and will disable it.
Hope this will help. :)