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WindowListener Singleton Method

Gregg Bolinger
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I have an application that spawns several JFrames. I have a windowTracker class that extends WindowListener and I use this class to track all my JFrames. The way I am using it is basically, when a window opens the WindowEvent for windowOpened() places a reference to that JFrame in a Hashmap along with the name of the JFrame. And in the windowClosing() I remove the window from the hashMap.
I am also using the Singleton method when creating my JFrames, meaning I have a getInstance() method that returns my JFrame object to whoever needs it. Here is my singleton method pseudo code:

Ok, everything works except, when I close any of the JFrames, I need to set theOnlyFrame back to NULL. And I would like to do this on the windowClosing() method. However, without using an IF statement and statically checking each frame I plan to create, I don't know how to do it.
Here is the code for my windowTracker class
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