anchor.diff:          <template>[[item]]</template>
         </vaadin-grid-column>
   
  -      <vaadin-grid-column width="40px" flex="0">
  +      <vaadin-grid-column width="40px" flex-grow="0">
           <template>
             <input type="checkbox" on-change="_onSelectionChange" checked="[[selected]]"></input>
           </template>
  
positive.code:     <template>[[item]]</template>
    </vaadin-grid-column>
  
    <vaadin-grid-selection-column width="40px" flex="0" select-all="[[selectAll]]">
      <template class="header">
        <paper-checkbox checked="{{selectAll}}"></paper-checkbox>
      </template>
  
negative.code: [[figure.vaadin-grid.selection.column]]
  image::img/vaadin-grid-selection-column.png[width="450"]
  
  In addition, you can customize the selection column by changing its [propertyname]#width#, [propertyname]#flexGrow#, [propertyname]#flexShrink# and [propertyname]#frozen# properties, or by providing your own templates.
  
  [source,html]
  ----
  