* 1. Component receives focus, perhaps because user clicked on it with the mouse.
* 2. Now component will receive user key press and release events from the keyboard.
* 3. Component loses focus. Perhaps user chose another component to interact with.
* 1. Component receives focus, perhaps because user clicked on it with the mouse.
* 2. Now component will receive user key press and release events from the keyboard.
* 3. Component loses focus. Perhaps user chose another component to interact with.