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In Interface Builder, NSMenuItem connects to ???what???

In Interface Builder I create a NSPopUpItem, using the directions in Chapter 21 of Apple's DTJC manual, I bind the <title> to the display group, i.e. the DB table, and the <selectedIndex> to a <key> of the EODisplayGroup.

This leaves the <MainWindow> showing an error in that NSMenuItem has a bad/missing connection. NSMenuItem being a sub-entity of NSPopUpItem.

And thus when I run I get a

java.lang.NullPointerException
at com.webobjects.eointerface.EOValueSelectionAssociation.subjectChanged(EO ValueSelectionAssociation.java:365)
at com.webobjects.eocontrol.EODelayedObserverQueue.notifyObserversUpToPrior ity(EODelayedObserverQueue.java:235)
at com.webobjects.eocontrol.EODelayedObserverQueue._processEndOfEventObserv ers(EODelayedObserverQueue.java:93)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.jav a:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor Impl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at com.webobjects.foundation.NSSelector.invoke(NSSelector.java:354)
at com.webobjects.foundation.NSSelector._safeInvokeSelector(NSSelector.java :108)
at com.webobjects.foundation.NSDelayedCallbackCenter$NSLightInvocation.invo ke(NSDelayedCallbackCenter.java:242)
at com.webobjects.foundation.NSDelayedCallbackCenter._eventEnded(NSDelayedC allbackCenter.java:208)
at com.webobjects.eointerface.swing.EOSwingUtilities$1.run(EOSwingUtilities .java:162)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:178)
-----
Baiss Eric Magnusson
Woodinville, WA
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