Index: core/windows/src/org/netbeans/core/windows/services/NbPresenter.java
===================================================================
RCS file: /shared/data/ccvs/repository/core/windows/src/org/netbeans/core/windows/services/NbPresenter.java,v
retrieving revision 1.26
diff -u -r1.26 NbPresenter.java
--- core/windows/src/org/netbeans/core/windows/services/NbPresenter.java	25 Nov 2005 09:15:40 -0000	1.26
+++ core/windows/src/org/netbeans/core/windows/services/NbPresenter.java	6 Dec 2005 08:46:11 -0000
@@ -154,6 +154,7 @@
     }
     
     private void initialize(NotifyDescriptor d) {
+        setDefaultCloseOperation (WindowConstants.DISPOSE_ON_CLOSE);
         //Optimization related to jdk bug 4393857 - on pre 1.5 jdk's an
         //extra repaint is caused by the search for an opaque component up
         //to the component root. Post 1.5, root pane will automatically be
Index: core/windows/test/unit/src/org/netbeans/core/windows/services/DialogDisplayerImplTest.java
===================================================================
RCS file: /shared/data/ccvs/repository/core/windows/test/unit/src/org/netbeans/core/windows/services/DialogDisplayerImplTest.java,v
retrieving revision 1.4
diff -u -r1.4 DialogDisplayerImplTest.java
--- core/windows/test/unit/src/org/netbeans/core/windows/services/DialogDisplayerImplTest.java	15 Sep 2005 20:10:23 -0000	1.4
+++ core/windows/test/unit/src/org/netbeans/core/windows/services/DialogDisplayerImplTest.java	6 Dec 2005 08:46:11 -0000
@@ -15,13 +15,18 @@
 
 import java.awt.Dialog;
 import java.awt.EventQueue;
+import java.lang.ref.Reference;
+import java.lang.ref.WeakReference;
+import java.lang.reflect.InvocationTargetException;
 import javax.swing.JButton;
+import javax.swing.JLabel;
 import javax.swing.JOptionPane;
 import javax.swing.SwingUtilities;
 import org.netbeans.junit.NbTestCase;
 import org.openide.DialogDescriptor;
 import org.openide.DialogDisplayer;
 import org.openide.NotifyDescriptor;
+import org.openide.util.RequestProcessor;
 
 /**
  *
@@ -36,6 +41,8 @@
     private JButton openChild;
     private JButton closeChild;
     private Dialog child;
+    private Dialog testDialog;
+    private Dialog swingDialog;
     
     public DialogDisplayerImplTest (String testName) {
         super (testName);
@@ -209,6 +216,63 @@
         
         assertFalse ("Leaf is dead", owner.isVisible ());
         assertFalse ("Child is dead too", child.isVisible ());
+    }
+    
+    /** Tests issue 55273: Dialogs created by DialogDisplayer are not disposed after close
+     * 
+     * @throws java.lang.Exception 
+     */
+    public void testDialogDisposed () throws Exception {
+        final DialogDescriptor dd = new DialogDescriptor (pane, "Hello", false, new Object[] {closeOwner}, null, 0, null, null);
+        //final DialogDescriptor dd = new DialogDescriptor (new JLabel ("Hello"), "Hello", false, null);
+        testDialog = DialogDisplayer.getDefault().createDialog(dd);
+        Reference ref = new WeakReference (testDialog);
+        SwingUtilities.invokeAndWait (new Runnable () {
+            public void run () {
+                testDialog.setVisible (true);
+            }
+        });
+        assertNotNull ("Test dialog lives.", ref.get ());
+        SwingUtilities.invokeAndWait (new Runnable () {
+            public void run () {
+                closeOwner.doClick ();
+            }
+        });
+        while (testDialog.isVisible ());
+        assertNotNull ("Test dialog still lives.", ref.get ());
+        testDialog.dispose();
+        testDialog = null;
+        RequestProcessor.getDefault ().post (new Runnable () {
+            public void run () {
+            }
+        }, 1000).waitFinished ();
+        assertGC ("Test dialog allocs no resources.", ref);
+        assertNull ("Test dialog must be dead.", ref.get ());
+    }
+    
+    public void testSwingDialogDisposed () throws Exception {
+        swingDialog = new Dialog ((Dialog)null, "Hello");
+        Reference ref = new WeakReference (swingDialog);
+        SwingUtilities.invokeAndWait (new Runnable () {
+            public void run () {
+                swingDialog.setVisible (true);
+            }
+        });
+        assertNotNull ("Test dialog lives.", ref.get ());
+        SwingUtilities.invokeAndWait (new Runnable () {
+            public void run () {
+                swingDialog.setVisible (false);
+            }
+        });
+        while (swingDialog.isVisible ());
+        assertNotNull ("Test dialog still lives.", ref.get ());
+        swingDialog = null;
+        RequestProcessor.getDefault ().post (new Runnable () {
+            public void run () {
+            }
+        }, 1000).waitFinished ();
+        assertGC ("Test dialog allocs no resources.", ref);
+        assertNull ("Test dialog must be dead.", ref.get ());
     }
     
     private void postInAwtAndWaitOutsideAwt (final Runnable run) throws Exception {