The XPages Extension Library must be enabled in each application. You can do this automatically the first time you use a control from the library.
When you first use a control from the XPages Extension Library in an application, a dialog asks if you want to enable the library. Click Continue
To manually enable or disable the library, open Application Properties
for the application, select the Advanced
tab, and select or deselect com.ibm.xsp.extlib.library
under XPage Libraries
Parent topic: Using controls from the XPages Extension Library