title: ExtJs Error: Uncaught TypeError: Cannot read property 'removeCls' of undefined
body: <p>I have an error when automatically load an Store data for a Grid and select records.</p>
  
  <p>I hope somebody could help me because I tried many way of fix this and I cant...</p>
  
  <p>I receive this error:
      Uncaught TypeError: Cannot read property 'removeCls' of undefined</p>
  
  <p>This is the context... I have 3 grids each of those have an Store and a Ext.selection.CheckboxModel. The third grid depends from de records selected (checked troght the selection checkbox model) in the second grid to load its information and after the information is loaded it marks (using the his own selection checkbox model) some records. The same happens with the second grid that depends in the first one lets say a kind of cascade where the main information comes from the user having access to some countries (first grid), and based on the countries where he has access I load the information of the states that belongs to the counstries where the user has access and once the information of those states is loaded I select those states where the user has access and so on to continue with the cities.</p>
  
  <p>Thank you</p>