@MartinIC,
I’ve experimented with both approaches recently and here is a summary of my findings so far:
WebView works quite nicely, but the version of Eto embedded in Rhino by default relies on IE under the hood. This makes things a bit more cumbersome to set up and requires a few hacks to get things to display properly. Having said that, you have ultimate control over the UI with JS/CSS:
More details here:
While working with pure Eto, you can try the approach linked to by @fraguada. It allows for some basic style overrides. If you want more flexibility, you’ll need to derive from a Drawable and paint your own controls with custom functionality. I suspect, that this is how @DavidRutten created the entire GH2 UI Here is my take on a Slider/Stepper/Text Box combo:
