Placing cursor in text field using AS3

I am a newbie to actionscript 3.0 and need a litlle help that I have not been able to find searching (for two weeks).
I would like the cursor to appear and blink in the first text field in a movie clip that gathers information to be sent to a php. The following does not work.
stage.focus = textField;
textField.setSelection(textField.text.length,textF ield.text.length);
And the only other things I find are for custom cursors. I just want the visitor to see the blinking cursor in the firstName_txt input box when the page appearss.
Also, if the visitor tabs from one input text field to the other, the blinking cursor appears in the first three input text fields but not in the fourth. Yet, the visitor can enter text in the fourth input text field.

I have tested by clicking crtl+enter and uploaded the files to my isp for testing. Neither effort is successful.
BTW, thanks for helping and I am sorry about the cross posting. My bad. I didn't realize there was a section for actionscript at the time.

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