Select document to open from selection made in a Combo Box

If you have used Acrobat to make your form, use the switch statement to evaluate the selection and set a string variable with the name of the file to open. The JavaScript will go in the "On Blur" action for the combo box.

// select document file name
var sFileName; // variable for file name

switch (this.getField(event.target.name).value) {

case "Select Document":
sFileName = ""; // empty file name
break;

case "Product 1":
sFileName = "ProductOne.PDF";
break;

case "Product 2":
sFileName = "ProductTwo.PDF";
break;

case "Product 3":
sFileName = "ProductThree.PDF";
break;

default:
sFileName = ""; //empty file name
app.alert("Unknown Selection: " + event.value);
break;
} // end selection

// open non-empty file name
if (sFileName != "") {
// open using relative path name
var otherDoc = app.openDoc(sFileName, this); // open selected doc
this.closeDoc(); // close current document
}

The above is not possible in Live Cycle Designer because Live Cycle Designer does not include the "app.openDod()" method.

This topic looks like the perfect solution to my situation. However, I am getting no response when I test the form. ComboBox is called "Chapters". I'm trying to easily move between chapters selected from a list.
Any ideas what I'm missing? Using Acrobat Pro 9.

Script:
// select document file name
var sFileName; // variable for file name

switch (this.getField(event.target.name).value) {

case "(Chapters)":
sFileName = ""; // empty file name
break;

case "Chapter 3":
sFileName = "Chapter3.pdf";
break;

case "Chapter 6":
sFileName = "Chapter6.pdf";
break;

default:
sFileName = ""; //empty file name
app.alert("Unknown Selection: " + event.value);
break;
} // end selection

// open non-empty file name
if (sFileName != "") {
// open using relative path name
var otherDoc = app.openDoc(sFileName, this); // open selected doc
this.closeDoc(); // close current document
}

Are there any errors in the console when you run the script?

In which event (and which field) have you attached the code?

Also, is the "disclosed" document property set for the chapters files?

HTH.