title: ExtJS4, How to prevent sending request every time user type text
body: <p>I have simple combo with remote store. <code>pagination</code>, <code>triggerAction</code> doesn't matter for me.
  All I need is disable sending request everytime I type smth in combo.
  <img src="https://i.stack.imgur.com/tXml6.png" alt="enter image description here"></p>
  
  <p>Even when I have <code>triggerAction: 'all'</code> request are being sent.
  How can I disable it? I need to load store just one time. Please help me!</p>