{
Update example
The following sample code sets the directory of DirectoryListBox1 to C:\TEMP when the form is created. When Button1 is pressed, a subdirectory called MYDIR is added to C:\TEMP, but note that it is not updated in DirectoryListBox1 until Button2 is pressed and Update is called.
} 
procedure TForm1.Button1Click(Sender: TObject);
begin
  MkDir('c:\temp\mydir');
end;
procedure TForm1.FormCreate(Sender: TObject);
begin
  DirectoryListBox1.Directory := 'c:\temp';
end;
procedure TForm1.Button2Click(Sender: TObject);
begin
  DirectoryListBox1.Update;
end; 
