code: function (dw, dh, id) {
          var w = Ext.getCmp(id);
          if (!w) {
              return;
          }
          
          // TinyMCE window manager opens the windows in two steps
          //
          // 1. displaying and loading iframe
          // 2. Adjusting the window size to the iframe
          //
          // It has an unbeatufiul eefect of resizing by
          // opening. Thus, we first open the window in the
          // invisible area, and center it only when resize is done.
  
          var size = w.getSize();
          w.setSize(size.width + dw, size.height + dh);
          w.center();
  
          var tinypopupIframe = w.getComponent('tiny_popup_iframe');
          if (!tinypopupIframe) { return; }
  
          var doc = tinypopupIframe.getEl().dom.contentDocument;
          if (!doc) { return; }
  
          // We do not focus in the standard way. It does not work under IE.
          // The standard focusing occurs too early when using ExtJS windows for the popups.
          // We do focusing here after resize.
  
          tinymce.each(doc.forms, function (g) {
              tinymce.each(g.elements, function (f) {
                  if (tinymce.DOM.hasClass(f, "mceFocus") && !f.disabled) {
                      f.focus();
                      return false;
                  }
              });
          });
  
          // This fixes the bug under IE - after moving the iframe is not visible.
          // But, we have to add this event after a delay, otherwise it removes the
          // focus from the field, what is set above.
  
          setTimeout(function () {
              w.on('move', function (win, x, y, opts) {
                  tinypopupIframe.getEl().focus();
              }, w);
          }, 1500);
      }
docs: -----------------------------------------------------------------