Some gadgets – called singular gadgets – cannot be combined with other singular gadgets on the same page. For example, you cannot combine an events calendar with a photo album on the same page. If a gadget is grayed out, it's because it's a singular gadget and the page you are editing already has a singular gadget.
Singular gadgets cannot be added to page templates or system pages.
The following gadgets are singular gadgets:
- Blog
- Discussion forum
- Donation form
- Event calendar
- Forum summary
- Membership application
- Member directory
- Photo album
- Subscription form