How do you simulate a keyboard enter event in UFT

I have a web application that I am testing with HP's UFT software. Within my application, there is a text field with an onkeydown attribute. When a key is pressed within the text field, a function is called which triggers different actions depending on what key was pressed. I am interested in the enter key. When the enter key is pressed, rows are created within the form. How can I simulate the enter key being pressed within the field?

I have tried

field1.Set Chr(13)

field1.FireEvent "onkeydown"

but it doesn't trigger the event.

I am trying aviod using the SendKeys command.

Solution

If you use device replay mode (as described in this answer) and send a vbCRLF your application will be able to see the enter key.

Setting.WebPackage("ReplayType") = 2 ''# Changes to device mode
Browser("Enter").Page("Enter").WebEdit("WebEdit").Set  "a" & vbCRLF

This works (on IE) for the following sample page:

<!DOCTYPE html>
<html>
<head>
<title>Enter</title>
<script>
function okd() {
if (event.keyCode == 13)
    alert("Got enter");
}
</script>
</head>
<body>
<textarea onkeydown="okd()"></textarea>
</body>