Wondering about Control structure, inside the Control-Gallery Demo

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Wondering about Control structure, inside the Control-Gallery Demo

Crawfish

So I'm looking over the Control-Gallery Demo, and see that the structure is:

Control
    ColorRect
        HSplitContainer (and so on...)

and I'm deeply confused as to why this is. 🙂 As I understand it, the HSplitContainer is a Control node, and could serve as the top-level Node. (For that matter, it seems like any node could be at the top). I tried some experimentation, and changing the color of the ColorRect, realized that the HSplitContainer had gaps/margins, which the color showed through. Okay, but ColorRect is also a Control Node, and presumably could be the top-level Node.

So is there some specific purpose to having a Control Node as the top? It seems like the ColorRect would work fine, and would have the exact same properties. Or is this just a convention?

For that matter, are there any conventions, or "rules", regarding top-level choice of node-type and structure? Or just whatever node works? Thanks.

Megalomaniak

Probably just for convenience. In case they'd want to group something else under that control along side the colorrect. Just a guess though.