title: EXTJS 3, how to display a grid to popup?
body: <p>In the EXTJS 3, how to display a grid to a popup ?</p>
  
  <p>I have this coding, why it doesn't work ?</p>
  
  <pre><code> var myData = [['ddd', '1111'], ['eee', '2222']];
  
              var store = new Ext.data.ArrayStore({
                  fields: [
                     { name: 'FLD' },
                     { name: 'VAL' }
                  ]
              });
              store.loadData(myData);
  
              var grid = new Ext.grid.GridPanel({
                  store: store,
                  loadMask: true,
                  colModel: new Ext.grid.ColumnModel({
                      defaults: {
                          width: 120,
                          sortable: true
                      },
                      columns: [
                          { header: 'FLD', dataIndex: 'FLD' },
                          { header: 'VAL', dataIndex: 'VAL' }
                      ]
                  }),
                  viewConfig: {
                      forceFit: true
                  }
              });
  
              var myWin = Ext.create("Ext.Window", {
                  layout: 'fit',
                  title: 'Exception Detail',
                  width: 400,
                  height: 300,
                  closable: false,
                  buttonAlign: 'center',
                  items: [grid],
                  modal: true
              });
              myWin.show();
  </code></pre>