Eclipse Task List - Mark Completed is not Active

Question

The Title says it all. I am using ADT and I have a source code full of //TODO tags. I can go through the tags using the Tasks View but when I want to mark a task as completed the Mark Completed option is grayed out.
what is the cause of this and how can I fix it ? deleting the //TODO tags for completed tasks is not an option, I want to be able to review my changes later.

Answer 1

Create another task flag in Preferences->Java->Compiler->Task Tags, say // DONE.

Then when you fix a TODO, change it in to a DONE which will still remain in the Tasks view but be distingishable

Answer 2

You can only mark tasks completed that you add through the add Task menu option in the Tasks view, you can't do this for tasks created because of // TODO.

This is described in Elipse bug 309567