How to Minimize Window via Standard Close Button
Available in: Actual Window Manager, Actual Window Minimizer.
Create specific settings for the desired target window.
Go to the Minimizing property sheet of just created settings.
In the Minimize Window Manually group mark the Via Close button click check box.
(Optional) In the Minimization Mode group of controls select where the target window should be minimized to:
taskbar (default value) - if you wish it minimized to the taskbar
tray - if you wish the target window minimized to the notification area
(Optional) If you wish to prevent the target window from being auto-restored then mark the Block self-restoration check box.
Apply your adjustments.