You can configure Adobe Experience Manager (AEM) 6 so that a custom xtype (that may be developed in an earlier version of AEM) works in the AEM 6 Touch UI. A custom xtype is an ExtJS script that uses the AEM widget API. By default, an AEM component that uses a custom xtype works in AEM classic view. However, by default, it will not work in AEM Touch UI. You have to further configure AEM 6 to make a custom xtype work in AEM 6 Touch UI, as shown in this illustration.
This is an illustration of a custom xtype working in AEM 6 Touch UI. This development article walks you through how to make a custom xtype work in AEM 6 Touch UI. To read it, click http://helpx.adobe.com/experience-manager/using/creating-touchui-xtypes.html.