Hi Jonathan:
Yes, you are right, i ask my friend again and he told me that it is not working in 12.
But he told me that there is a workaround.
Remember I told you that in WD 11 it's working, well you can program your window with the control in WD 11, and just import that window to your WD 12 project, but do not touch it in WD 12.
Hope this helps.
Andres Sanchez