Need some idea about evnt handler

Hi
I am developing an application, the GUI part is like yahoo messenger.
So while execution,first the mainwindow appears, from that window1 appears, from window1 window2 appears.window2 has a textfield, that takes userinput(string) by textfield.getText() method.
My requirement is: how can I use the inputted textfield string to be used as label of a button in mainwindow.
I know the technique of returning the string from window2 to mainwindow,
but don't know how to use eventhandler, sothat during runtime only the mainwindow will be updated with that button getting the string from textfield of window2

Are you willing to pay for unemployed engineer to help you with this?

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