[fpc-pascal] TListBox bug in LCL of Lazarus?

[Jürgen Hestermann]

> If you are using MessageBox from the LCL, then it uses UTF-8.
> Maybe your are using a Windows API.

For example, I am just writing

MessageBox(0,'Programmfehler!','SPEED TEST',MB_ICONEXCLAMATION or 
                    MB_TopMost or MB_SetForeGround);

the interface part has the following "uses" entries

   LCLIntf, Messages, SysUtils, Classes, Graphics, Controls, Forms,
   Dialogs, StdCtrls, LResources;


and the implementation part uses

Windows,FileCtrl,DateUtils,clipbrd,interfaces;

So what am I using and how do I know what I should use?

Jürgen Hestermann.