title: the combo box editor in cell editing grid does not deselect after choosing a value
body: <p>I am having an editor grid with four columns and i am trying to implement a sql builder. The where statement will have four fields namely "condition1" "operator" "condition2" "and/or".
  I am using a combo box to select between and/or/none and there is a delete button as row action. when I delete a row and if that row is the last,the value of and/or combo in the previous row will be set as "none". I am able to achieve that but the problem is , when the combo box is <strong>selected</strong> in the previous row and i delete the row next to it, the value changes in the store but not in the view. the value changes in the view when the combo box is <strong>not selected</strong> in the previous row.
  my code is :</p>
  
  <pre><code>if(rowIndex == grid.all.endIndex)
     {
      //get the previous record and set the vale to none
      var previousRowRecord = grid.store.getAt(rowIndex-1); 
      previousRowRecord.set('andor','NONE');
      //delete the current record
      grid.getStore().removeAt(rowIndex);
      grid.getView().refresh();
     }
  else
     {
       grid.getStore().removeAt(rowIndex);
     }
  </code></pre>
  
  <p>How to deselect a combo box once the value is selected ? i think this can be a work around</p>