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Editorial Team
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Asked: 2026-05-17T23:23:01+00:00

I was looking at the implementation of the TCustomComboBoxEx object since I need to

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I was looking at the implementation of the TCustomComboBoxEx object since I need to create a custom combo box in delphi and I was triying to get what I needed, when suddenly I came over this piece of code:

...
[UIPermission(SecurityAction.LinkDemand, Window=UIPermissionWindow.AllWindows)]
procedure TCustomComboBoxEx.CreateWnd;
var
  ChildHandle: THandle;
  I: Integer;
  StrEnum: IEnumString;
  EditHandle: THandle;
begin
...

What is that upon the procedure name? What is its purpose?

Code like that work in delphi 2007 (my code needs to keep compatibility with that version)

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1 Answer

  1. Editorial Team

    Those are attributes. They were added to the standard VCL controls for support of the VCL.NET (which no longer exists, BTW). Attributes are supported now with Delphi 2010 and up.

    You can read more in the Delphi documentation wiki

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