Why don't you use the Owner forms feature? Makes owned forms minimize/restore/close and overlay with the owner automatically.

Of curiosity I also checked Resize event when maximizing a form, and it does happen twice, but only once for WindowState Maximized. If you need to know that a regular resize event is not followed by a maximized/minimize/restore resize event you can use the ResizeBegin and ResizeEnd events, they don't occur for min/max/restore.

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