Doesn't work with custom elements.

[ciriousjoker]

I'm submitting a bug report

• Framework Version:
  1.0.1

Please tell us about your environment:

• Operating System:
  Windows 10

• Node Version:
  v8.11.3

• NPM Version:
  5.6.0 (but im using yarn anyway)

• Webpack version
  webpack 4.16.0

• Browser:
  Chrome 67

• Language:
  TypeScript 2.9.2

Current behavior:
parent.createChild() doesn't work.
createChild() is not a function.

This only happens with custom elements.

Expected/desired behavior:

buildRowCallback() should parse "<div>test</div>" just like "<some-element></some-element>".

Using <template> around the custom element doesn't work. <template> is set to display: none for some reason.
<some-element> is available as a global resource, so that's not the problem.

• What is the motivation / use case for changing the behavior?

So many possibilities.

I will create a minimum failing example if you want me to.