diff --git a/user/src/com/google/gwt/uibinder/elementparsers/DialogBoxParser.java b/user/src/com/google/gwt/uibinder/elementparsers/DialogBoxParser.java
index 707f673..10ed6d6 100644
--- a/user/src/com/google/gwt/uibinder/elementparsers/DialogBoxParser.java
+++ b/user/src/com/google/gwt/uibinder/elementparsers/DialogBoxParser.java
@@ -27,18 +27,15 @@
 public class DialogBoxParser implements ElementParser {
   public void parse(XMLElement elem, String fieldName, JClassType type,
       UiBinderWriter writer) throws UnableToCompleteException {
-
-    String autoHide = elem.consumeBooleanAttribute("autoHide", false);
-    String modal = elem.consumeBooleanAttribute("modal", true);
-
+    
     String caption = null;
     String body = null;
 
     for (XMLElement child : elem.consumeChildElements()) {
       if ("caption".equals(child.getLocalName())) {
         if (caption != null) {
-          writer.die("In %s, may have only one <%s:caption>",
-              elem, elem.getPrefix());
+          writer.die("In %s, may have only one <%s:caption>", elem,
+              elem.getPrefix());
         }
 
         HtmlInterpreter interpreter = HtmlInterpreter.newInterpreterForUiObject(
@@ -53,12 +50,11 @@
           writer.die("In %s, found non-widget %s", elem, child);
         }
         body = writer.parseElementToField(child);
-     }
+      }
     }
+
+    handleConstructorArgs(elem, fieldName, type, writer);
     
-    writer.setFieldInitializerAsConstructor(fieldName,
-        writer.getOracle().findType(DialogBox.class.getCanonicalName()),
-        autoHide, modal);
     if (caption != null) {
       writer.addStatement("%s.setHTML(\"%s\");", fieldName, caption);
     }
@@ -66,4 +62,22 @@
       writer.addStatement("%s.setWidget(%s);", fieldName, body);
     }
   }
+
+  /**
+   * If this is DialogBox (not a subclass), parse constructor args
+   * and generate the constructor call. For subtypes do nothing.
+   */
+  private void handleConstructorArgs(XMLElement elem, String fieldName,
+      JClassType type, UiBinderWriter writer) throws UnableToCompleteException {
+    boolean custom = !type.equals(writer.getOracle().findType(
+        DialogBox.class.getCanonicalName()));
+    if (!custom) {
+      String autoHide = elem.consumeBooleanAttribute("autoHide", false);
+      String modal = elem.consumeBooleanAttribute("modal", true);
+
+      writer.setFieldInitializerAsConstructor(fieldName,
+          writer.getOracle().findType(DialogBox.class.getCanonicalName()),
+          autoHide, modal);
+    }
+  }
 }
diff --git a/user/src/com/google/gwt/uibinder/rebind/FieldWriter.java b/user/src/com/google/gwt/uibinder/rebind/FieldWriter.java
index 605e1de..95e81aa 100644
--- a/user/src/com/google/gwt/uibinder/rebind/FieldWriter.java
+++ b/user/src/com/google/gwt/uibinder/rebind/FieldWriter.java
@@ -42,6 +42,9 @@
   // this will need to become a set
   JClassType getAssignableType();
 
+  /**
+   * @return the custom initializer for this field, or null if it is not set
+   */
   String getInitializer();
 
   /**
diff --git a/user/test/com/google/gwt/uibinder/elementparsers/DialogBoxParserTest.java b/user/test/com/google/gwt/uibinder/elementparsers/DialogBoxParserTest.java
index e617807..3f8bda0 100644
--- a/user/test/com/google/gwt/uibinder/elementparsers/DialogBoxParserTest.java
+++ b/user/test/com/google/gwt/uibinder/elementparsers/DialogBoxParserTest.java
@@ -16,6 +16,7 @@
 package com.google.gwt.uibinder.elementparsers;
 
 import com.google.gwt.core.ext.UnableToCompleteException;
+import com.google.gwt.dev.javac.impl.MockJavaResource;
 import com.google.gwt.uibinder.rebind.FieldWriter;
 
 import junit.framework.TestCase;
@@ -32,6 +33,20 @@
 
   private static final String PARSED_TYPE = "com.google.gwt.user.client.ui.DialogBox";
 
+  private static final MockJavaResource DIALOG_SUBCLASS = new MockJavaResource(
+      "my.MyDialogBox") {
+    @Override
+    protected CharSequence getContent() {
+      StringBuffer code = new StringBuffer();
+      code.append("package my;\n");
+      code.append("import com.google.gwt.user.client.ui.DialogBox;\n");
+      code.append("public class MyDialogBox extends DialogBox {\n");
+      code.append("  public MyDialogBox() { super(false, true); }");
+      code.append("}\n");
+      return code;
+    }
+  };
+
   private ElementParserTester tester;
 
   @Override
@@ -143,7 +158,7 @@
       assertNotNull(tester.logger.died);
     }
   }
-  
+
   public void testBadElemContent() throws SAXException, IOException {
     StringBuffer b = new StringBuffer();
 
@@ -158,7 +173,7 @@
       assertNotNull(tester.logger.died);
     }
   }
-  
+
   public void testBadTextContent() throws SAXException, IOException {
     StringBuffer b = new StringBuffer();
 
@@ -175,4 +190,40 @@
       assertNotNull(tester.logger.died);
     }
   }
+
+  public void testSubclassOkay() throws UnableToCompleteException,
+      SAXException, IOException {
+    DialogBoxParser parser = new DialogBoxParser();
+    String typeName = "my.MyDialogBox";
+    tester = new ElementParserTester(typeName, parser,
+        DIALOG_SUBCLASS);
+
+    StringBuffer b = new StringBuffer();
+
+    b.append("<ui:UiBinder xmlns:ui='" + ElementParserTester.BINDER_URI + "'");
+    b.append("    xmlns:my='urn:import:my'");
+    b.append("    xmlns:g='urn:import:com.google.gwt.user.client.ui'>");
+    b.append("  <my:MyDialogBox>");
+    b.append("    <g:caption>Hello, I <b>caption</b>you.</g:caption>");
+    b.append("    <g:Label>And your little dog, too!</g:Label>");
+    b.append("  </my:MyDialogBox> ");
+    b.append("</ui:UiBinder>");
+    
+    String[] expected = {
+        "fieldName.setHTML(\"Hello, I <b>caption</b>you.\");",
+        "fieldName.setWidget(<g:Label>);",};
+
+    parser.parse(tester.getElem(b.toString(), "my:MyDialogBox"), "fieldName", 
+        tester.parsedType, tester.writer);
+    FieldWriter w = tester.fieldManager.lookup("fieldName");
+    
+    assertNull(w.getInitializer());
+
+    Iterator<String> i = tester.writer.statements.iterator();
+    for (String e : expected) {
+      assertEquals(e, i.next());
+    }
+    assertFalse(i.hasNext());
+    assertNull(tester.logger.died);
+  }
 }
diff --git a/user/test/com/google/gwt/uibinder/elementparsers/ElementParserTester.java b/user/test/com/google/gwt/uibinder/elementparsers/ElementParserTester.java
index 3fc4c22..0f01550 100644
--- a/user/test/com/google/gwt/uibinder/elementparsers/ElementParserTester.java
+++ b/user/test/com/google/gwt/uibinder/elementparsers/ElementParserTester.java
@@ -25,7 +25,6 @@
 import com.google.gwt.dev.resource.Resource;
 import com.google.gwt.dev.util.log.PrintWriterTreeLogger;
 import com.google.gwt.uibinder.attributeparsers.AttributeParsers;
-import com.google.gwt.uibinder.attributeparsers.BundleAttributeParsers;
 import com.google.gwt.uibinder.rebind.FieldManager;
 import com.google.gwt.uibinder.rebind.FieldWriter;
 import com.google.gwt.uibinder.rebind.MockMortalLogger;
@@ -44,6 +43,7 @@
 
 import java.io.IOException;
 import java.io.PrintWriter;
+import java.util.Arrays;
 import java.util.Set;
 
 /**
@@ -89,18 +89,22 @@
   final ElementParser parser;
 
   @SuppressWarnings("deprecation")
-  ElementParserTester(String parsedTypeName, ElementParser parser)
-      throws UnableToCompleteException {
+  ElementParserTester(String parsedTypeName, ElementParser parser,
+      Resource... moreJava) throws UnableToCompleteException {
     this.parser = parser;
     String templatePath = "TemplatePath.ui.xml";
     String implName = "ImplClass";
+    Set<Resource> uiResources = getUiResources();
+    uiResources.addAll(Arrays.asList(moreJava));
     CompilationState state = CompilationStateBuilder.buildFrom(createLogger(),
-        getUiResources());
+        uiResources);
     types = state.getTypeOracle();
 
+    // Fully qualified to avoid deprecation warning on the import line
+    com.google.gwt.uibinder.attributeparsers.BundleAttributeParsers bundleParsers = new com.google.gwt.uibinder.attributeparsers.BundleAttributeParsers(
+        types, logger, null, templatePath, null);
     elemProvider = new XMLElementProviderImpl(new AttributeParsers(types, null,
-        logger), new BundleAttributeParsers(types, logger, null, templatePath,
-        null), types, logger);
+        logger), bundleParsers, types, logger);
 
     fieldManager = new FieldManager(types, logger);
     JClassType baseType = types.findType("my.Ui.BaseClass");
@@ -113,6 +117,17 @@
     parsedType = types.findType(parsedTypeName);
   }
 
+  public XMLElement getElem(String string, String tag) throws SAXException,
+      IOException {
+    Document doc = docHelper.documentFor(string);
+    Element w3cElem = (Element) doc.getDocumentElement().getElementsByTagName(
+        tag).item(0);
+    Assert.assertNotNull(String.format(
+        "Expected to find <%s> element in test DOM", tag), w3cElem);
+    XMLElement elem = elemProvider.get(w3cElem);
+    return elem;
+  }
+
   public FieldWriter parse(String xml) throws UnableToCompleteException,
       SAXException, IOException {
 
@@ -122,19 +137,9 @@
     b.append(xml);
     b.append("</ui:UiBinder>");
 
-    parser.parse(getElem(b.toString()), FIELD_NAME, parsedType, writer);
-    return fieldManager.lookup(FIELD_NAME);
-  }
-
-  private XMLElement getElem(String string) throws SAXException, IOException {
-    Document doc = docHelper.documentFor(string);
     String tag = "g:" + parsedType.getName();
-    Element w3cElem = (Element) doc.getDocumentElement().getElementsByTagName(
-        tag).item(0);
-    Assert.assertNotNull(String.format(
-        "Expected to find <%s> element in test DOM", tag), w3cElem);
-    XMLElement elem = elemProvider.get(w3cElem);
-    return elem;
+    parser.parse(getElem(b.toString(), tag), FIELD_NAME, parsedType, writer);
+    return fieldManager.lookup(FIELD_NAME);
   }
 
   private Set<Resource> getUiResources() {
diff --git a/user/test/com/google/gwt/uibinder/test/UiJavaResources.java b/user/test/com/google/gwt/uibinder/test/UiJavaResources.java
index 9aa6810..905b914 100644
--- a/user/test/com/google/gwt/uibinder/test/UiJavaResources.java
+++ b/user/test/com/google/gwt/uibinder/test/UiJavaResources.java
@@ -79,6 +79,7 @@
       StringBuffer code = new StringBuffer();
       code.append("package com.google.gwt.user.client.ui;\n");
       code.append("public class DialogBox extends Widget {\n");
+      code.append("  public DialogBox(boolean autoHide, boolean modal) {} ");
       code.append("}\n");
       return code;
     }
diff --git a/user/test/com/google/gwt/uibinder/test/client/FooDialog.java b/user/test/com/google/gwt/uibinder/test/client/FooDialog.java
new file mode 100644
index 0000000..525e88f
--- /dev/null
+++ b/user/test/com/google/gwt/uibinder/test/client/FooDialog.java
@@ -0,0 +1,27 @@
+/*
+ * Copyright 2009 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+package com.google.gwt.uibinder.test.client;
+
+import com.google.gwt.user.client.ui.DialogBox;
+
+/**
+ * A custom subclass of DialogBox, to prove we can use them.
+ */
+public class FooDialog extends DialogBox {
+  FooDialog() {
+    super(false, false);
+  }
+}
diff --git a/user/test/com/google/gwt/uibinder/test/client/UiBinderTest.java b/user/test/com/google/gwt/uibinder/test/client/UiBinderTest.java
index 30fcbcd..791a9b4 100644
--- a/user/test/com/google/gwt/uibinder/test/client/UiBinderTest.java
+++ b/user/test/com/google/gwt/uibinder/test/client/UiBinderTest.java
@@ -182,6 +182,13 @@
   public void testCustomButtonBody() {
     assertEquals("Hi mom", widgetUi.toggle.getText());
   }
+  
+  public void testCustomDialogBox() {
+    assertEquals("Custom dialog am I", widgetUi.fooDialog.getText());
+    Widget body = widgetUi.fooDialog.iterator().next();
+    assertTrue(body instanceof Label);
+    assertEquals("body", ((Label)body).getText());
+  }
 
   public void testDomAccessAndComputedAttributeOnPlaceholderedElement() {
     WidgetBasedUiExternalResources resources = GWT.create(WidgetBasedUiExternalResources.class);
diff --git a/user/test/com/google/gwt/uibinder/test/client/WidgetBasedUi.java b/user/test/com/google/gwt/uibinder/test/client/WidgetBasedUi.java
index d80036c..1aa457e 100644
--- a/user/test/com/google/gwt/uibinder/test/client/WidgetBasedUi.java
+++ b/user/test/com/google/gwt/uibinder/test/client/WidgetBasedUi.java
@@ -152,6 +152,7 @@
   @UiField DivElement bundledDivLegacy;
   @UiField ToggleButton toggle;
   @UiField HTML styleLess;
+  @UiField FooDialog fooDialog;
 
   public WidgetBasedUi() {
     external.style().ensureInjected();
diff --git a/user/test/com/google/gwt/uibinder/test/client/WidgetBasedUi.ui.xml b/user/test/com/google/gwt/uibinder/test/client/WidgetBasedUi.ui.xml
index bd4fe66..285e3bc 100644
--- a/user/test/com/google/gwt/uibinder/test/client/WidgetBasedUi.ui.xml
+++ b/user/test/com/google/gwt/uibinder/test/client/WidgetBasedUi.ui.xml
@@ -534,6 +534,11 @@
 
 	<gwt:ToggleButton ui:field='toggle'>Hi mom</gwt:ToggleButton>
 
+    <demo:FooDialog ui:field='fooDialog'>
+      <gwt:caption>Custom dialog am I</gwt:caption>
+      <gwt:Label>body</gwt:Label>
+    </demo:FooDialog>
+
     <h2>How to use the debugId, addStyleNames, addDependentStyleNames attributes</h2>
     <p>You can use the <strong>debugId</strong>, <strong>addStyleNames</strong>, and <strong>addDependentStyleNames</strong>
        attributes on any widget that extends UIObject.