GroupDescendentsWith - Why 'TCustomAction' is promoted to TControl?

[GabrielMoraru 30]

Here is a code snippet from VCL.controls.pas:

initialization

  ...

  StartClassGroup(TControl);

  ActivateClassGroup(TControl);

  GroupDescendentsWith(VCL.ImgList.TCustomImageList, TControl);

  GroupDescendentsWith(TCustomAction, TControl);

finalization

  ...

end.

Why is TCustomAction which derive from TComponent "promoted" to a TControl?

 

[Pat Foley 54]

So that it is found in the controls list of the control or component vs the components list of a form or application.  

[GabrielMoraru 30]

Just now, Pat Foley said:

So that it is found in the controls list of the control or component vs the components list of a form or application.  

Oh... I thought it is related somehow to the Palette. THANKS