Do we want a FunctionBindingExtension

[JohanLarsson]

Would be similar to FunctionExtension but enable binding to functions in the viewmodel. Thinking something like:

MouseLeftButtonDown="{fsxaml:Handler {fsxaml:FunctionBinding onMouseLeftDown},
                                     {fsxaml:Function local:Map.mouseEventArgsToPoint}}"

Not sure about it, perhaps it is just api bloat. It would rid us of the need for an IObserver<'t>/ICommand in the viewmodel.

downsides

• API bloat
• Will be hard to get intellisense or even validation as the providevalue method is not called in designtime. In the constructor there is not much context so not much we can do there, that I know.