The title says it all. Right now there's only a check all option. In the out of the box Grid CheckList filter the only way to clear all items for a checklist filter once filter items have been selected is to: 1) Uncheck each one individually 2) Click "Check All" to check all, then click "Check All" again to uncheck all. It would be great to just have a clear all/clear selection button in the filter list.