Winforms Control Invalidate OnResize

Addresses an issue when hosting the WinForms control in a simple panel that upon resize it's contents aren't redrawn.

Updates the example to include an easy to validate representation.
I'd like to keep `SimpleBrowserForm` for a little bit, there's still a bug where you can't initialize the browser outside of the constructor, hence the `CreateBrowser()` method, was going to start debugging that scenario.