This page describes all the xtypes that are available with Adobe Experience Manager (AEM).
In the ExtJS language, an xtype is a symbolic name given to a class. You can read the "Component XTypes" paragraph of the Overview of ExtJS 2 for a detailed explanation about what an xtype is and how it can be used.
For a complete information on all the available widgets in AEM refer to the widget API documentation.
To find out in which components a given xtype is used in AEM, you can use the following Xpath query in CRXDE by replacing 'checkbox' with the xtype that you are interested in: