How do i get the components when a new window opens from the main window?

In a given application, i am able to get the list of components for the main window. When an event happens in the main window, now a new window opens here how do i get the components for this newly opened window?

getContentPane().getComponents() can be used, only if i know that new class name thats been poped up when the event happens to that main window....
Is there anyway in runtime to know that new class name & fetch the event...

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