unclecheese/DataObjectManager — comment on commit b28d86fc05867d7f92776c40a7173c342f68f615
File:  line 0
By s-m:

I'm sorry if there is a bug in there, I've been using this fix for quite a long time and have never experienced any issues with it...
I've taken this patch from http://www.silverstripe.org/dataobjectmanager-module-forum/show/13657 , it's supposed to enable you to overwrite the default behavior of having new items unchecked in the list, as described in the forum post.