This is actually quite a bit of a tricky task to pull off. In most cases you can get away with the following (but not all):

[pascal]procedure ForceFocus(AForm:TForm);
begin
Application.SetFocus;
Application.Focus(AForm);
Application.BringToFront;
AForm.BringToFront;
end;[/pascal]

I may have a mis-type in there, as normal I'm working w/o a net (IDE). The idea is there. Note that this will not fix the modal issues in Windows XP, that requires another hack all together.