javafx 1.2.0_b211 used with NetBeans 6.5.1

Unidirectional binding to "text" variable of TextBox can cause exception.
 "bind with inverse" is required for "text" variable of TextBox

           TextBox {
                 // text: bind inputString // <-- This will cause exception
                 text: bind inputString with inverse // <-- This is OK
                 columns: 20
                 translateX: 10
                 translateY: 40
            },