title: panel hide when collapse in extjs
body: <p>I try to explain my problem. I have a tab panel. In one tab I have a form panel and a grid panel, both collapsable. When I collapse the form panel it will collapse, when I collapse the gridpanel both are collapsed. Now when I uncollapse one of the two panels the other one disappears. What could this be?</p>
  
  <pre><code>Ext.define('MyApp.view.TMS', {
      extend: 'Ext.container.Viewport',
  
      id: 'tmsViewport',
      layout: {
          type: 'border'
      },
  
      initComponent: function () {
          var me = this;
  
          Ext.applyIf(me, {
              items: [{
                  xtype: 'tabpanel',
                  id: 'mainTab',
                  activeTab: 0,
                  region: 'center',
                  items: [{
                      xtype: 'panel',
                      id: 'configurationTab',
                      title: 'Configuration',
                      items: [{
                          xtype: 'tabpanel',
                          id: 'configurationVehicles',
                          title: 'configuration',
                          activeTab: 0,
                          items: [{
                              xtype: 'panel',
                              id: 'configurationDrivers',
                              collapsed: false,
                              title: 'Drivers',
                              items: [{
                                  xtype: 'form',
                                  floating: false,
                                  height: 400,
                                  id: 'configurationDriversConfiguration',
                                  itemId: 'configurationDriversConfiguration',
                                  bodyPadding: 10,
                                  animCollapse: false,
                                  collapsed: false,
                                  collapsible: true,
                                  title: 'Driver Configuration',
                                  items: [{
                                      xtype: 'button',
                                      id: 'configurationDriversAdd',
                                      text: 'Add'
                                  }, {
                                      xtype: 'button',
                                      id: 'configurationDriversDelete',
                                      text: 'Delete'
                                  }, {
                                      xtype: 'textfield',
                                      id: 'configurationDriversCode',
                                      fieldLabel: 'Driver Code'
                                  }, {
                                      xtype: 'textfield',
                                      id: 'configurationDriversName',
                                      fieldLabel: 'Driver Name'
                                  }, {
                                      xtype: 'textfield',
                                      id: 'configurationDriversLicense',
                                      fieldLabel: 'Driver License nr'
                                  }, {
                                      xtype: 'textfield',
                                      id: 'configurationDriversGivenName',
                                      fieldLabel: 'Driver Given Name'
                                  }, {
                                      xtype: 'textfield',
                                      id: 'configurationDriversFamilyName',
                                      fieldLabel: 'Driver Familiy Name'
                                  }, {
                                      xtype: 'textfield',
                                      id: 'configurationDriversPhone',
                                      fieldLabel: 'Driver Phone Nr'
                                  }, {
                                      xtype: 'textfield',
                                      id: 'configurationDriversEmail',
                                      fieldLabel: 'Driver Email'
                                  }, {
                                      xtype: 'combobox',
                                      id: 'configurationDriversProvider',
                                      fieldLabel: 'Provider',
                                      displayField: 'name',
                                      store: 'comboProviders',
                                      valueField: 'id'
                                  }, {
                                      xtype: 'textareafield',
                                      id: 'configurationDriversMemo',
                                      fieldLabel: 'Memo'
                                  }, {
                                      xtype: 'button',
                                      handler: function (button, event) {
                                          var form = document.forms;
  
                                          Ext.MessageBox.alert('Submitted Values', form.getValues(true));
  
  
                                      },
                                      height: 37,
                                      id: 'configurationDriversSave',
                                      text: 'Save'
                                  }]
                              }, {
                                  xtype: 'gridpanel',
                                  height: 300,
                                  id: 'configurationDriversGrid',
                                  itemId: 'configurationDriversGrid',
                                  animCollapse: false,
                                  collapsible: true,
                                  title: 'Drivers',
                                  store: 'gridDrivers',
                                  viewConfig: {
  
                                  },
                                  columns: [{
                                      xtype: 'gridcolumn',
                                      dataIndex: 'id',
                                      text: 'Id'
                                  }, {
                                      xtype: 'gridcolumn',
                                      dataIndex: 'version',
                                      text: 'Version'
                                  }, {
                                      xtype: 'gridcolumn',
                                      dataIndex: 'driverId',
                                      text: 'DriverId'
                                  }, {
                                      xtype: 'gridcolumn',
                                      dataIndex: 'firstName',
                                      text: 'FirstName'
                                  }, {
                                      xtype: 'gridcolumn',
                                      dataIndex: 'middleName',
                                      text: 'MiddleName'
                                  }, {
                                      xtype: 'gridcolumn',
                                      dataIndex: 'lastName',
                                      text: 'LastName'
                                  }, {
                                      xtype: 'gridcolumn',
                                      dataIndex: 'email',
                                      text: 'Email'
                                  }, {
                                      xtype: 'gridcolumn',
                                      dataIndex: 'workPhone',
                                      text: 'WorkPhone'
                                  }, {
                                      xtype: 'gridcolumn',
                                      dataIndex: 'note',
                                      text: 'Note'
                                  }, {
                                      xtype: 'gridcolumn',
                                      dataIndex: 'licenseNumber',
                                      text: 'LicenseNumber'
                                  }, {
                                      xtype: 'gridcolumn',
                                      dataIndex: 'providerId',
                                      text: 'ProviderId'
                                  }]
                              }]
                          }]
                      }]
                  }]
              }]
          });
  
          me.callParent(arguments);
      }
  
  });
  </code></pre>