I'm following a wxCrafter tutorial on youtube, one of yours, I think. Nice tutorial. But after I lay out the three wxGrids and click "Show Preview", the Form's background is incomplete. The wxGrid, too. In the pic, the Preview is the bottom Form.

I tried wxCrafter once before and it was the same way. I super like the tool, but this is a deal breaker for me.
Why is this happening? And what can be done to "fix" it?