added additional attributes to allow for index dependent attributes

Issue: WICKET-2776


git-svn-id: https://svn.apache.org/repos/asf/wicket/branches/wicket-1.4.x@922649 13f79535-47bb-0310-9956-ffa450edef68

wicket/src/main/java/org/apache/wicket/markup/html/form/RadioChoice.java

@@ -507,7 +507,7 @@ else if (displayValue != null)
 
 				// Allows user to add attributes to the <input..> tag
 				{
-					IValueMap attrs = getAdditionalAttributes();
+					IValueMap attrs = getAdditionalAttributes(index, choice);
 					if (attrs != null)
 					{
 						for (Map.Entry<String, Object> attr : attrs.entrySet())
@@ -559,9 +559,11 @@ else if (displayValue != null)
 	/**
 	 * You may subclass this method to provide additional attributes to the &lt;input ..&gt; tag.
 	 * 
+	 * @param index
+	 * @param choice
 	 * @return tag attribute name/value pairs.
 	 */
-	protected IValueMap getAdditionalAttributes()
+	protected IValueMap getAdditionalAttributes(final int index, final T choice)
 	{
 		return null;
 	}