[Lazarus] TToolButton:.Marked

[Werner Pamler via Lazarus]

Does anybody know what the property "Marked" of TToolButton is good for? 
I never realized it, but it's been there at least since Laz 1.0, and in 
Delphi at least since D7. And it does not do anything, even in Delphi. 
Delphi's help 
(http://docs.embarcadero.com/products/rad_studio/delphiAndcpp2009/HelpUpdate2/EN/html/delphivclwin32/ComCtrls_TToolButton_Marked.html) 
says: "Use Marked to get or set whether the button is marked." What a 
nonsense! Then: "A marked button has a shaded surface. ". Well, in 
reality they look the same. And even if this were true what would be the 
difference to "Down" then?

Werner
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