TSmoothPanel - shadow not usually transparent

TAdvSmoothPanel shadow is usually not transparent. I'm hoping you will tell me I've simply left out some setting. If there is a label behind it, the label shows through the shadow just a I expect.

But if there is grid, panel, button, or other component it's not at all transparent and looks quite awkward.

Am I missing something that allows this to be transparent?

You had already sent this exact same question via direct support email, so it was already answered there. Please refrain from double posting support questions.

Sorry, I thought maybe you'd rather have the answer here for others to see.