Cannot render again Ext.window.Window when DIV is updated

I render a Window into a DIV with the renderTo config. However, there is some AJAX function that can update that same DIV with other HTML content.When I try to load the Window again after the DIV had been updated, the Window is not rendered. I have no errors in console.

I have to refresh the whole page to make it render again. I suspect that I have to destroy the component, before updating the DIV, but eveything I tried is not working.

this is my window:

Code:

       mapWindow = Ext.create('Ext.window.Window', {
          title: "Layer: {{ shapefile }} | Click on feature to edit.",
          id: 'mapWindow',
          x: 350,
          y: 120,
          height: 800,
          width: 1000,
          renderTo: 'pageContent',
          floatable: true,
          collapsible: true,
          closable: true,
          bodyBorder: false,
          maximizable: true,
          shadowOffset: 6,
          layout: 'fit',
          items: [
              mappanel
          ]
      }).show();