How to change status of an issue?

```
What steps will reproduce the problem?
1. Submit an issue (like issue #48 - a random totally unbiased example,
guaranteed)
2. Have someone awesome (like Neil Fraser himself!) answer your issue and mark
it "Done"
3. Post some additional trouble to your issue thread

What is the expected output? What do you see instead?
Unmarking the issue as "Done" is not possible, causing the issue's additional
trouble to go unnoticed and effectively leaving unresolved issues marked as
"Done"...

What version of the product are you using? On what operating system?
Google code, on the internet

Please provide any additional information below.
I like pizza.
```

Original issue reported on code.google.com by `logic....@gmail.com` on 6 Jun 2011 at 1:29