All I get when I implement this component is a vertical list of numbers from 1 to 5. There are no instructions on what to place into the OnNotify event or what I need to do to make this work.  The component may be great, but it's implementation is not obvious enough for it to just work.  yes, I hooked it up to my integer value that keeps the rating number and the ReadOnly property is set to False.  You say it's easy, and I would have to disagree for a fairly new developer in the OutSystems platform, this control is NOT as easy as it should be.