(xiaoxiang has not posted this question here <asked me personally>, I posted the answer becuase i think this will be helpful for some other users)
Q: how to develop password text entry control?
A:
For passwords, you may want to consider the text entry control. It has a
[color=red:4eb7d]maskCharacter attribute[/color:4eb7d] which allows a specified mask character to be
displayed in place of actual typed characters.