I've made some additional comments further up. As for comments here about requestChange, the model should actually be updated automatically. However, it looks like the prototree is not correct. You have simple valuebinding which probably is trying to set the text of the element to the model value. Although since it's an input probably nothing is happening. What you really want to do is something similar to what's used for the magnifier follows adjuster. You can also look at the documentation http://wiki.fluidproject.org/display/docs/Renderer+Component+Tree+Expanders#RendererComponentTreeExpanders-SelectionToInputsExpander