Mysaifu JVM

I have an application that nakes a window on the scree using AWT. If the user closes the screen by clicking top right X, I can fnd nothing that tells my application that the screen has been closed. The usual listener

winListener = new WindowAdapter() {

addWindowListener( winListener );

then winListener doesn't get called when they close the window.

I don't care that this mechanism doesn't seem to work, but there must be some event that will tell me. Can you help me ?