 <p>we can set an empty array to the Filtering select widgets store.</p> <pre><code>dijit.byId('widgetId').store.data.splice(0,dijit.byId('widgetId').store.data.length); </code></pre> <p>or simply,</p> <pre><code>dijit.byId('widgetId').store.data = []; </code></pre> <p>Or you can set the store itself as null. (But, to add new options after this, you need to recreate the store again, before adding up the new options).</p> <pre><code>dijit.byId('widgetId').store = null; </code></pre>