title: ExtJS 3.4 - Select row after load store of my gridpanel
body: <p><strong>My grid panel:</strong></p>
  
  <pre><code>new Ext.grid.GridPanel({
      title: "Utilisateurs",
      layout: 'fit',
      style: marginElement,
      columns: mesColonnesUtil,
      id: 'gridPanelUtil',
      width: '70%',
      colspan: 2,
      collapsible: false,
      layout: 'fit',
      autoWidth: true,
      monitorResize: true,
      height: 200,
      store: storeUtil,
      stripeRows: true,
      selModel: new Ext.grid.RowSelectionModel({
          singleSelect: true
      }),
      listeners: {
          click: function () {
              this.selModel.getSelected();
          }
      }
  });
  </code></pre>
  
  <p><strong>My store:</strong></p>
  
  <pre><code>var storeUtil = new Ext.data.JsonStore({
      proxy: proxyGrUtil,
      baseParams: {
          method: 'storeUtil',
          gr: ''
      },
      autoLoad: true,
      fields: ["Nom", "Prenom", "LDAPUser"],
      root: "rows",
      totalProperty: "total",
      successProperty: "success"
  });
  </code></pre>
  
  <p>My <code>combobox</code> with select event, I load my grid panel with params:</p>
  
  <pre><code>{
      xtype: 'combo',
      store: storeGrUtil,
      id: 'comboGrUtil_GrUtil',
      width: 300,
      valueField: "id",
      displayField: "lib",
      triggerAction: 'all',
      mode: 'local',
      listeners: {
          select: function () {
              Ext.getCmp('gridPanelUtil').store.load({
                  params: {
                      gr: Ext.getCmp('comboGrUtil_GrUtil').getValue() // this the value of items selected combobox
                  }
              })
          }
      }
  }
  </code></pre>
  
  <p>After this event, I can't select a row in my grid panel, why ?
  I don't understand.</p>