Custom Build Trigger - Disable and Delete

Hi,

I'm trying to create a custom build trigger, that works in a similar way to the "Finish Build Trigger", but delays the run by x minutes.

I've created the skeleton of the trigger, but when I add it to a build configuration I am unable to delete or disable the trigger (the "more" link is shown, but hovering/clicking shows no options). Am I missing something to allow this to work?

The code is on GitHub https://github.com/rhysgodfrey/team-city-delayed-finish-build-trigger, It is currently very much work in progress. This is also my first proper plugin and my Java is a little rusty so apologies if the code looks a little scruffy.

Thanks,
Rhys