@Override
    public void setLostFocusBehavior(LostFocusBehavior lostFocusBehavior) {
        this.lostFocusBehavior = lostFocusBehavior;
    }
Changes the application's behavior when unfocused.

By default, the application will
{@link LostFocusBehavior#ThrottleOnLostFocus throttle the update loop}
so as not to use 100% of the CPU when out of focus, e.g.
alt-tabbed, minimized, or hidden by another window.

@param lostFocusBehavior The new lost focus behavior to use.

@see LostFocusBehavior
jme3-core/src/main/java/com/jme3/app/LegacyApplication.java