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    <p>The problem is that the 'this' keyword in your second event listener is not set correctly. </p> <p>Your button event listener works correctly because by using the 'handler' property to register the listener ExtJs binds the function automatically to the current button object.</p> <p>This is what the docs say about <code>Ext.button.Button#scope</code>:</p> <blockquote> <p>scope : Object The scope (this reference) in which the handler and toggleHandler is executed. Defaults to this Button.</p> </blockquote> <p>However, when registering listeners using the 'listener' property one has to specify the 'scope' property otherwise the 'this' reference points to the global window object.</p> <p>See <a href="http://docs.sencha.com/ext-js/4-1/#!/api/Ext.util.Observable-method-addListener" rel="nofollow">the docs for the listener property</a></p> <p>In your case the best approach might be to register the listener like this:</p> <pre><code>this.campaignsComboBox = Ext.create('Ext.form.field.ComboBox', { .. }); this.campaignComboBox.on( 'select', function() { this.fireEvent('testEvent'); }, /* 'scope' aka 'this' reference: */ this.campaignsComboBox); </code></pre> <p><strong>UPDATE</strong></p> <p>Here is a working jsfiddle: <a href="http://jsfiddle.net/nXSAN/" rel="nofollow">http://jsfiddle.net/nXSAN/</a></p> <p>Another way to get the correct reference in your listener is to make use of the first function parameter, which is actually a reference to the ComboBox object (in case of the <code>select</code> event):</p> <pre><code> function(cmp) { cmp.fireEvent('testEvent'); } </code></pre> <p><strong>UPDATE2</strong> Sencha (or my provider) is having troubles with Sencha's CDN, so here an 'offline' version.</p> <pre><code>&lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"&gt; &lt;html&gt; &lt;head&gt; &lt;meta http-equiv="Content-Type" content="text/html; charset=utf-8" /&gt; &lt;title&gt;Extjs&lt;/title&gt; &lt;link rel="stylesheet" type="text/css" href="extjs-4.1.1/resources/css/ext-all.css"/&gt; &lt;script type="text/javascript" src="extjs-4.1.1/ext-all.js"&gt;&lt;/script&gt; &lt;script type="text/javascript"&gt; Ext.define('App.view.prospects.Filter', { alias: 'widget.prospectsfilter', extend: 'Ext.form.Panel', itemId: 'prospectsfilter', height: 50, width: 100, layout: 'fit', initComponent: function() { this.combo = Ext.create('Ext.form.field.ComboBox', { itemId: 'campaignsComboBox', text: 'Test', queryMode: 'local', displayField: 'name', valueField: 'name', store: Ext.create('Ext.data.ArrayStore', { fields: ['name'], data: [ ['entry1'], ['entry2'], ['entry3'] ] }), listeners: { select: function() { this.fireEvent('testEvent') } } }); this.items = [ this.combo ]; this.callParent(arguments); } }); Ext.define('App.controller.ProspectsFilter', { extend: 'Ext.app.Controller', init: function() { this.control({ 'prospectsfilter #campaignsComboBox': { 'testEvent': function() { console.log('Found #campaignsComboBox!'); } } }); } }); Ext.application({ name: 'App', autoCreateViewport: false, launch: function() { Ext.create('App.view.prospects.Filter', { renderTo: Ext.getBody() }); var controller = Ext.create('App.controller.ProspectsFilter', { application: this }); controller.init(this); } }); &lt;/script&gt; &lt;/head&gt; &lt;body&gt;&lt;/body&gt; &lt;/html&gt; </code></pre>
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    1. POWhy do these selectors fail for ExtJS ComboBox in this.control()?
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    1. COThanks. I realize this is likely a scope issue, but I've already tried your suggestion (I did again just now with no difference), as well as adding the scope:this to the listener definition. No difference. I am still stuck.
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    2. COI am still not 100% convinced that you've got the 'this' reference correct. Adding `scope: this` to your listener config above would actually set the 'this' reference to the 'Ext.form.Panel' instance. Can you see why?
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    3. COoops. just noticed my code example makes the very same mistake: the scope should be set to `this.campaignComboBox` and not `this` which points to the form panel.
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