title: ExtJS Modern - column.getCell is not a function
body: <p>I have an ExtJS 6.2.0.981 Modern application. I am trying to add a "textfield" into a grid cell but I get the following error: </p>
  
  <pre><code>column.getCell is not a function
  </code></pre>
  
  <p><a href="https://fiddle.sencha.com/#view/editor&amp;fiddle/2rbt" rel="nofollow noreferrer">Here</a> is the fiddle</p>
  
  <p>I checked the <a href="https://docs.sencha.com/extjs/6.2.0/modern/Ext.grid.cell.Widget.html" rel="nofollow noreferrer">DOCS</a> for the "widgetcell" component and it states: 
  This class is used for Ext.grid.Grid cells that contain a child Ext.Component or Ext.Widget. This cell type is typically used by specifying Ext.grid.column.Widget column type.</p>
  
  <p>But Ext.grid.column.Widget seems to have been removed.</p>