context: proto._updatePage = function(e){  var oldTab = e.getOldValue();  var newTab = e.getNewValue();  if (oldTab && oldTab.getPage()) {    oldTab.getPage().setVisible(false);  };  if (newTab && newTab.getPage()) {    newTab.getPage().setVisible(true);  };    this._layoutInternalWidgetsVertical();  this._layoutInternalWidgetsHorizontal();};
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