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    <p>You're not calling Init. </p> <p>Simply proxy the init function for checked in your nullableChecked init function like you did in the update.</p> <pre><code>ko.bindingHandlers.nullableChecked = { init: function(element, valueAccessor) { ko.bindingHandlers.checked.init(element, valueAccessor); }, update: function (element, valueAccessor) { var value = ko.utils.unwrapObservable(valueAccessor()); if (value == null) element.indeterminate = true; ko.bindingHandlers.checked.update(element, valueAccessor); } }; </code></pre> <p>Without the init, it's never actually setting up a "click" binding on the checkbox to tell knockout that something has changed. If you look at the debug code (<a href="http://knockoutjs.com/downloads/knockout-2.2.1.debug.js" rel="nofollow">http://knockoutjs.com/downloads/knockout-2.2.1.debug.js</a>), you'll see that init uses jQuery to set up a 'click' event on the checkbox to update the observable when the value changes.</p> <pre><code>ko.bindingHandlers['checked'] = { 'init': function (element, valueAccessor, allBindingsAccessor) { var updateHandler = function() { var valueToWrite; if (element.type == "checkbox") { valueToWrite = element.checked; } else if ((element.type == "radio") &amp;&amp; (element.checked)) { valueToWrite = element.value; } else { return; // "checked" binding only responds to checkboxes and selected radio buttons } var modelValue = valueAccessor(), unwrappedValue = ko.utils.unwrapObservable(modelValue); if ((element.type == "checkbox") &amp;&amp; (unwrappedValue instanceof Array)) { // For checkboxes bound to an array, we add/remove the checkbox value to that array // This works for both observable and non-observable arrays var existingEntryIndex = ko.utils.arrayIndexOf(unwrappedValue, element.value); if (element.checked &amp;&amp; (existingEntryIndex &lt; 0)) modelValue.push(element.value); else if ((!element.checked) &amp;&amp; (existingEntryIndex &gt;= 0)) modelValue.splice(existingEntryIndex, 1); } else { ko.expressionRewriting.writeValueToProperty(modelValue, allBindingsAccessor, 'checked', valueToWrite, true); } }; ko.utils.registerEventHandler(element, "click", updateHandler); // IE 6 won't allow radio buttons to be selected unless they have a name if ((element.type == "radio") &amp;&amp; !element.name) ko.bindingHandlers['uniqueName']['init'](element, function() { return true }); }, </code></pre> <p><strong>Edit:</strong> Here's a Fiddle: <a href="http://jsfiddle.net/cclose/NFfVn/" rel="nofollow">http://jsfiddle.net/cclose/NFfVn/</a></p>
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    1. COActually, to enable updates from code, the update callback in the handler should set the indeterminate property to false if the value != null
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