Actionscript 3.0 :: Cursor Not Advancing As User Types?

I'm creating simple input text field. There's a whole lot of other things going on, but basically the text field is working fine - except for one strange thing: the cursor does not advance as the user types. The result is that as the user types different characters they just stack up on top of each other. The characters don't overwrite one another, but rather just stack up in the space for the first character. Here's the part of my code that defines the text field:

Code: Select allpublic function makeTextField():void{
var myFont:Font = new BankGothicMed();
var myTextFieldFormat:TextFormat = new TextFormat();

[code]....