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Access to the Java Object Layer
The GUIKit framework provides Mathematica functions, such as PropertyValue[{"widgetName", "propertyName"}], for accessing state or calling methods on 
instances using InvokeMethod[{"widgetName", "methodName"}, arguments]. However, this does not prevent you from using the standard J/Link techniques for manipulating any underlying 
that makes up the runtime interface.
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Here is what this interface will display as on a typical platform.
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The first argument of a GUIObject is the root window Java class, in this case a 
instance. You can make method calls on this component while the interface is running.
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Here is the user interface now. (The interface has been resized to display the entire title.)
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WidgetReference[] looks up specially registered instances; such utility GUIObject functions also return 
instances, and so any object in the interface can be accessed directly with J/Link method calls.
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Here is the user interface now.
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