How does TGridPanel add the Row property to all its child controls?

Hi all,

Delphi 2006 introduced a TGridPanel, which aligns child controls in a grid.
When you place a (e.g.) TEdit in a TGridPanel, it gains some extra properties, like
        property Row: Integer;
which is the Row that the TEdit will be placed in inside the TGridPanel.

How is that possible? Is it even possible in pure Delphi code, or does it need built-in compiler support? For example, Is it possible to implement TGridPanel on Delphi 7?

My purpose it to make something like TGridPanel or TFlowPanel, but which will align the child controls according to other properties (not row/column) which I will add to every TControl descendant inside the panel.
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alkisgAsked:
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TNameCommented:
And this:
"Adding a 'fake' property to a component"
http://bdn1.borland.com/article/0,1410,33448,00.html
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TNameCommented:

Hi, just in case you haven't seen them yet, here are some links I find very interesting
(the first link is important, the other documents are linked from it anyway...):
Haven't read the articles thoroughly yet, but I will.


http://hallvards.blogspot.com/2007/03/review-delphi-2007-for-win32-beta-part_11.html

http://blogs.codegear.com/abauer/archive/2007/02/24/32322.aspx

http://dn.codegear.com/article/33421   (or  http://dn.codegear.com/article/33421 )
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alkisgAuthor Commented:
Starting from your first link, I ended up on your last link (without actually seeing your last post),
http://bdn1.borland.com/article/0,1410,33448,00.html
which is just what I needed.

Unfortunately, D2006 is required to implement this, but I think the result will be worth it.

Thanks!
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