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copied!<p>Why can't you add an <a href="http://wicket.apache.org/apidocs/1.4/org/apache/wicket/ajax/form/AjaxFormChoiceComponentUpdatingBehavior.html" rel="nofollow"><code>AjaxFormChoiceComponentUpdatingBehavior</code></a> to the <code>CheckGroup</code> ?</p> <p>From <code>AjaxFormComponentUpdatingBehavior</code>'s JavaDoc: </p> <blockquote> <p>NOTE: This behavior does not work on Choices or Groups use the AjaxFormChoiceComponentUpdatingBehavior for that.</p> </blockquote> <p><a href="http://wicket.apache.org/apidocs/1.4/org/apache/wicket/ajax/form/AjaxFormChoiceComponentUpdatingBehavior.html" rel="nofollow"><code>AjaxFormChoiceComponentUpdatingBehavior</code></a> is the behavior to use with <code>CheckGroup</code>s and <code>RadioGroup</code>s. If you used an <code>AjaxFormComponentUpdatingBehavior</code> with the <code>onchange</code> event, you'd run into <a href="http://webbugtrack.blogspot.com/2007/11/bug-193-onchange-does-not-fire-properly.html" rel="nofollow">this bug</a> with IE . <code>AjaxFormChoiceComponentUpdatingBehavior</code> handles this properly, <a href="http://grepcode.com/file/repo1.maven.org/maven2/org.apache.wicket/wicket/1.4.8/org/apache/wicket/ajax/form/AjaxFormChoiceComponentUpdatingBehavior.java#63" rel="nofollow">adding <code>onclick</code> event handlers</a> to each of the <code>Check</code>s in the <code>CheckGroup</code>. </p> <p>As a side note, what Igor stated in that mail, is that <code>CheckBox</code> can be replaced with <code>AjaxCheckBox</code>, not <code>Check</code>. <code>AjaxCheckBox</code> is nothing more than a convenience subclass of <code>CheckBox</code> with an <code>AjaxFormComponentUpdatingBehavior("onclick")</code>, as <a href="http://grepcode.com/file/repo1.maven.org/maven2/org.apache.wicket/wicket/1.4.4/org/apache/wicket/ajax/markup/html/form/AjaxCheckBox.java" rel="nofollow">the sources</a> show.</p>

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