Subclassing of Form components doesn't work well

[rynowak]

I tried subclassing EditNumber to implement something similar to this

It doesn't work because the genered code from a razor file calls base.BuildRenderTree - you get the rendering of the base class and what you wrote.

We should be able to fix this by making it unnecessary for a component to call base.BuildRenderTree. In general, it's a good idea if we can avoid extensibility points where an inheritor has to call base

[arivoir]

Completely agree, we should not be forced to call the base. Currently if the base is not called the StateHasChanged stops working.