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We need a way to programmatically detect when a TopComponent is undocked from a containing window, and dropped onto the 'free' desktop area. According to http://bits.netbeans.org/dev/javadoc/org-openide-windows/org/openide/windows/doc-files/api.html : "Currently, there is no support for listening to changes in Mode nor in TopComponent, though both have modifiable properties which in principle there might be a need to listen to." A couple of people have written classes to try to address this deficit: http://netbeans.sourcearchive.com/documentation/6.8/TopComponentDragSupport_8java_source.html http://alvinalexander.com/java/jwarehouse/netbeans-src/core/windows/src/org/netbeans/core/windows/view/dnd/TopComponentDragSupport.java.shtml