diff --git a/src/main/java/io/asfjava/ui/core/form/ComboBox.java b/src/main/java/io/asfjava/ui/core/form/ComboBox.java
index 070a591..1ad0418 100644
--- a/src/main/java/io/asfjava/ui/core/form/ComboBox.java
+++ b/src/main/java/io/asfjava/ui/core/form/ComboBox.java
@@ -28,7 +28,7 @@
 
 	String title();
 
-	String[] values();
+	String[] values() default {};
 
 	boolean autofocus() default false;
 
@@ -39,5 +39,7 @@
 	boolean required() default false;
 
 	int size() default 1;
+	
+	Class<? extends TitleMapsAdapter> titleMap() default TitleMapsAdapter.class;
 
-}
\ No newline at end of file
+}