Open window problem

From: Gautham Ramkumar <gautham_at_iwaynet.net>
Date: 1997/10/27
Message-ID: <01bce326$007a2ac0$9f0101c0_at_gramkum>#1/1


[Quoted] In a pre update trigger I had the foll code. if :block.field is null then
  message(' some message');
  open_window('some_window');
end if;

Now when I try to commit a record only the message shows up. ie if I click [Quoted] on the save once the message shows up and if I click again then the window [Quoted] shows up. Why? Shouldn't the window automatically show up after displaying the message Received on Mon Oct 27 1997 - 00:00:00 CET

Original text of this message