Click the vso complete pull request button when all are status options are green.
For everyone working with VSO and having to babysit your pull requests as you wait for builds to finish, this chrome extension is for you!
Because builds take a fairly long time (in the order of minutes) it is highly likely that on a team of moderate size, as you wait for your build to finish, somebody else will check into the base branch. This will kick off a new merge evaluation, which kicks off another build. And so on.
Having to sit and wait for this to go through and to remember to come back right after the build finished so that you can check in, is a real pain and wasted time.
The extension will click the re-evaluate button for you, wait until builds are finished, click the complete pull request button and will alert you to any problems.