Hmm.. those things still aren't working for me. Did you commit everything? At any rate, I'd suggest against reimplmenting or replacing refreshView if possible. And I'm not quite sure I understand why you have tried to do that as a work around here. Some more details might be helpful. 

Also I have to say I made a mistake when reading the code before. I mistook the preview for the slider. So the slider is in the prototree and should be refreshed every time you rerender. The problem from what I can see now is that there is some breakage between the preview and the model. The model is being updated correctly, but the preview isn't displaying those changes until it is refreshed.