How to Minimize Window via Standard Close Button
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:
(Optional) If you wish to prevent the target window from being auto-restored then mark the Block self-restoration check box.
Apply your adjustments.