Author: Misha Moellner

Change the appearance of a forms caption bar from active to inactive (flashing)

Answer:

Flashes the window only once; for repeated flashing you should use e.g. a TTimer 

uses
  Windows;

1   procedure TForm1.Button1Click(Sender: TObject);
2   begin
3     { Handle identifies the window to be flashed }
4     FlashWindow(Handle, true);
5   end;