Look at
procedure TCustomForm.WMActivate(var Message : TLMActivate);
// The button reappears in some situations (e.g. when the window gets the
//"urgency" flag) so we hide it again here.
// This is the most important place to invoke UpdateShowInTaskBar, since
//invoking it anywhere else seeems basically useless/frequently reversed.
if (ShowInTaskBar = stNever) or ((ShowInTaskBar = stDefault)
and (Application.TaskBarBehavior = tbSingleButton)) then
begin
UpdateShowInTaskBar;
end;
For non main form it hide and show every time the form is activated, when
use "Application.TaskBarBehavior := tbSingleButton" in the project.
I think the to resolve a problem in GTK2 "The button reappears in some
situations"
Thanks
--
Zaher Dirkey
--
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