code: function restoreCustomTabContentAggregation(sAggregationName, oCustomTab) {
  		// Make sure page1 exists, as this method may be called on destroy(), after the page was destroyed
  		// Suppress creation of new page as the following logic is needed only when a page already exists
  		if (!this._getPage1(true)) {
  			return;
  		}
  
  		// only the 'customTabs' aggregation is manipulated with shenanigans
  		if (sAggregationName === 'customTabs' && oCustomTab) {
  			/* oCustomTab must be an instance of the "customTab" aggregation type and must be the last opened page */
  			if (oCustomTab.getMetadata().getName() === this.getMetadata().getManagedAggregation(sAggregationName).type &&
  				this._vContentPage === oCustomTab.getId()) {
  				/* the iContentPage property corresponds to the custom tab id - set the custom tab content aggregation
  				 back to the custom tab instance */
  				var oPage1Content = this._getPage1().getContent();
  				oPage1Content.forEach(function (oContent) {
  					oCustomTab.addAggregation('content', oContent, true);
  				});
  			}
  		} else if (!sAggregationName && !oCustomTab) {
  			/* when these parameters are missing, cycle through all custom tabs and detect if any needs manipulation */
  			var oPage1Content = this._getPage1().getContent();
  			/* the vContentPage property corresponds to a custom tab id - set the  custom tab content aggregation back
  			 to the corresponding custom tab instance, so it can be reused later */
  			this.getCustomTabs().forEach(function (oCustomTab) {
  				if (this._vContentPage === oCustomTab.getId()) {
  					oPage1Content.forEach(function (oContent) {
  						oCustomTab.addAggregation('content', oContent, true);
  					});
  				}
  			}, this);
  		}
  
  	}
docs: Handle the "content" aggregation of a custom tab, as the items in it might be transferred to the dialog page
  instance.
  @param {string} sAggregationName The string identifying the aggregation that the given object should be removed from
  @param {object} oCustomTab Custom tab instance
  @private