Unterschied einfache Taste - Tastenkombination

[toms]

So geht's bei mir:

Delphi-Quellcode:

procedure Memo1KeyDown(Sender: TObject; var Key: Word; 
  Shift: TShiftState); 
begin 
  if (key = 17) or ((key = vk_prior) and (shift = [ssSHIFT] )) then 
  begin 
    PageControl1.ActivePageIndex:=1; 
    if memo2.CanFocus then 
       memo2.SetFocus; 
    key := $0;
  end; 
end;