A Little Success With Graphics

After a couple days of work, there's been some success along with a frustrating and perplexing mystery.

The Good News
The PC platform in windowed mode works, rendering scenes using nothing but calls to overridden abstract methods.

The Bad News
The display mode selector is completely, inexplicably broken, so full-screen mode doesn't work.  Neither does windowed mode unless I bypass the selector entirely when retrieving the platform graphics context.

So, it's a start, but there's still some distance to travel before I'll call it "ready".