Some Task Tags are not recognized in Eclipse 3.6

Question

I am fairly new to Eclipse, and I am attempting to define some new Task Tags in the

"Preferences" -> "General" -> "Editors" -> "Structured Text" -> "Task Tags" setting.

Of the three I have defined ("???", "TEMP", "SYM"), only the "???" is being recognized and imported into the "Tasks" panel.

Does anyone know why the other two tags are not being recognized?

Thanks for any help.