Ensure child views in field form are closed

Signed-off-by: Byron Ruth <b@devel.io>
Move check for _changing flag in set itself

Signed-off-by: Byron Ruth <b@devel.io>
Consolidate view rendering in workspace

Signed-off-by: Byron Ruth <b@devel.io>
Merge pull request #615 from cbmi/issue-614

Prevents rogue event handlers from being called