XAML design-time support?

[chucker]

Hi,

first of all, this is pretty cool.

One thing I figured I could do is see an approximation of the dialog live in the XAML designer.

However, VS says it "cannot be edited in design view". I'm not entirely sure if this is merely an incompatibility in VS 2017, or if design-time support is missing altogether. (In which case I'm not sure what it would take to implement.)

Is this at all feasible?

Thanks