title: Extjs allign only cell text to right
body: <p>i need to align cell text to right side.</p>
  
  <pre><code>{
              xtype : 'numbercolumn',
              dataIndex : 'lineAmount',
              id : 'lineAmount',
              header : 'Net Line amount',
              sortable : true,
              width : 150,
              summaryType : 'sum',
              css: 'text-align: rigth;',
              summaryRenderer : Ext.util.renderers.summary.sum,
              editor : {
                  xtype : 'numberfield',
                  allowBlank : false
              }
  </code></pre>
  
  <p>adding align property does not work for me because it also aligns header text</p>