title: Ext js grid remove selection model
body: <p>I have a situation where I need to dynamically add or remove grids selection model.</p>
  
  <p>Searching the documentation I see that the selection model doesn't have a <code>destroy()</code> method or anything similar. How can I remove or destroy a selection model from a grid in ext js 4.x.?</p>
  
  <p>If this is not possible I still have an option to revert some functionallity and dynamically add the selection model to an <strong>already</strong> created grid. But I'm also not sure if this is possible.</p>