How to move the cursor in a text input programatically

Hi,

I am using a TextInput field and a my own keyboard UI with buttons for each alphabet.

When the user presses buttons on the keyboard UI, i populate the TextInput field through data binding.

But I would want the cursor to move as the characters are entered in the field at the same time.

So, how do I move the cursor using actionscript code?

thanks,

Sunil