function to create new window called multiple times problem

There is a function that create a new window. However, when a second window is created, it takes the content of the first window instead of generating its own new content (items), and the first window get empty.

If I close the first window before calling the function again, a new window and content are correctly created. How can I preserve the content of previously created window each time a new window is created?

Code:

function createWindow(feat_id, pos_x, pos_y, bounds, value){

  var map = new OpenLayers.Map('map',
            { projection: new OpenLayers.Projection("EPSG:3857"),
              numZoomLevels: 20,
              });
  
  map.size = new OpenLayers.Size(250,250);
  var bounds = new OpenLayers.Bounds.fromArray(bounds);
  map.zoomToExtent(bounds);
  
// this panel is the content  
   var geoExtPanel = Ext.create('GeoExt.panel.Map', {
       id: 'geoExtPanel',
       map: map,
       border: 0,
   });
  
  var mapWin = Ext.create('Ext.window.Window', {
    title: "Layer: {{ layer.filename }} | Feature: " + value, 
    id: feat_id,
    x: pos_x,
    y: pos_y,
    height: 250,
    width: 250,
    layout: 'fit',
    items: [
       geoExtPanel
    ],
    collapsible: true,
    autoDestroy: false,
    bodyBorder: false,
    shadowOffset: 6,
    renderTo: Ext.getBody(),
  }).show();
}

function to create new window called multiple times problem