When Ensemble is dragged so that the top-left corner is past the top left corner of the screen and then a resizing of the window is attempted,
an IndexOutOfBoundsException is thrown.

java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
        at java.util.ArrayList.RangeCheck(ArrayList.java:547)
        at java.util.ArrayList.get(ArrayList.java:322)
        at com.sun.javafx.collections.ObservableListWrapper.get(ObservableListWrapper.java:141)
        at ensemble.controls.WindowResizeButton$2.handle(WindowResizeButton.java:62)
        at ensemble.controls.WindowResizeButton$2.handle(WindowResizeButton.java:59)
        at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:60)
        at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:162)
        at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:115)
        at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:38)
        at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:37)
        at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92)
        at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:35)
        at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92)
        at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:47)
        at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:33)
        at javafx.event.Event.fireEvent(Event.java:171)
        at javafx.scene.Scene$MouseHandler.process(Scene.java:2668)
        at javafx.scene.Scene$MouseHandler.process(Scene.java:2489)
        at javafx.scene.Scene$MouseHandler.access$1200(Scene.java:2462)
        at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1195)
        at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:1779)
        at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:200)
        at com.sun.glass.ui.View.handleMouseEvent(View.java:256)
        at com.sun.glass.ui.View.notifyMouse(View.java:516)
        at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
        at com.sun.glass.ui.win.WinApplication.access$100(WinApplication.java:29)
        at com.sun.glass.ui.win.WinApplication$2$1.run(WinApplication.java:62)
        at java.lang.Thread.run(Thread.java:662)