ActionScript 1/2 :: Move Blinking Cursor Too?

I've got a main textfield myTextfield01. When I put focus on another textfield which is empty (either manually by clicking on another field, or like below using setFocus) I want the focus to go back to myTextField01 again. And put the blinking cursor and the very end of whatever is typed into it. So I tried this.
 
myTextfield01.onKillFocus = function(newFocus:Object) {    if (newFocus.text == "") {        Selection.setFocus(myTextfield01);        Selection.setSelection(myTextfield01.text.length-1, myTextfield01.text.length);    }}; 

But that didn't work. It went back to myTextfield01, but the blinking cursor stayed at the empty textfield and any text typed would be added to that empty field.When I put this in frame one:
 
myTextfield01.onKillFocus = function(newFocus:Object) {    if (newFocus.text == "") {        nextFrame());    }}; 
And this in frame two:
Selection.setFocus(myTextfield01);        Selection.setSelection(myTextfield01.text.length-1, myTextfield01.text.length);   

it did work. Both focus and cursor where in myTextfield01 again.So why doesn't it work when I combine it all in one frame?