Make subform visible by making a selection in a dropdown

I am trying to make a subform visible if the user select yes from a dropdown.

I have the following setup on the form

Subfom1 -Dropdown with 3 entries, Select, No Yes.

Subform2 – Text field for users to enter test

The code I have been trying to use is

“execEvent("change"); In the Initialize event and in the change event I was using

if (xfa.event.change == "5") {

    subform2.presence = "visible";

}

When I try the form, nothing happens,. There is no errors in the Javascript debugger

Any ideas would be helpful.

I am running Adobe LiveCycle Designer 8.05.2073.1.374024

Any ideas would be helpful

Chomp