How to handle keypressed event for form

i have to handle keypressed event of a textfield control.
I have tried by implementing itemstatechangelistner ........
but as api specifies its behavior varies from device to device....it is guaranteed that the control is notified when losing its focus. But my requirement is to get notified for every keypressed time.....
any idea.....pls help me

Can't be done for TextField. Many devices (example:SE k700i) launch a separate editing screen to change the text in a TextField.
db

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