var co= window.external.GetCustomObject("co", "test");
var f1= co.GetCustomFieldByName("field1");
var f2 = co.GetCustomFieldByName("field2");
var f3 = co.GetCustomFieldByName("field3");
var id = co.GetCustomFieldByName("ID");
fields f1,f2,f3 are retrived succesfully but id returns undefined.
Could anyone help.