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//#style sendMessage
txtSendMessage = new TextField("Send Message","",150, TextField.ANY);
this.smsScreen.append(txtSendMessage);
In what language, java?
You can add an event listener to the textbox and every time, some one types a char, you can check the size of the text that the texbox is holding and change the style of the textbox.
If you want a more precise answer, please supply some more info about the programming language, what type of gui you are using etc. etc.