Steps:

1. Create Content Type with ezobjectrelationlist
2. Go to Content/Content structure and click Create
3. Select Content Type frow step 1
4. Click Select Content to open UDW
5. Go to Search tab and type something to receive several results (for example *)
6. Click some buttons

Actual result:

button disappears after clicking. The only way to uncheck chosen item is to go to Confirmed items.
http://g.recordit.co/IbBaSi95xl.gif

Expected result:

should be green after checking - like it is on Browse tab.