WebDynpro ABAP applications do not show up as a service in SICF

I am creating ABAP WebDynpro applications using Repository Browser->Web dynpor comp./Intf. component type (the standard way of creating webdynpro applications).

Some application show up under the SICF service "path /sap/bc/webdynpro/sap/<my application>" , but other don't show up at all. All applications (whether they show up in SICF or not) work fine.

Any reason why some applications don't show up in SICF? shouldn't all applications show up in SICF?