How to change the skin in a As3 mobile project

Hi,

I'm having problems with the parameter "textField.displayAsPassword". Basically it does not work in the iOS device (it works in the emulator).

Seems like change the skin into  spark.skins.mobile.TextInputSkin would solve the issue; but I'm not working in FLex directly, I'm working in a AS3 project.

How I can change the skin?

thanks!