How to bring a window to the front programmatically?

Question

Cocoa

Created a CheckBox to enable / disable the display of the program in the Dock, but when the program is hidden, all windows disappear.
I put Sent Action deminiaturize on the item in the bar menu: and the window appears when you click on this item,
but when you try to call [[self window] deminiaturize: self]; in the code - nothing happens.

-(void)changeDockVisible:(id)sender {
    if ([NSApp activationPolicy] == NSApplicationActivationPolicyRegular) {
        [[NSUserDefaults standardUserDefaults] setBool:YES forKey:NVHideDockIcon];
        [NSApp setActivationPolicy:NSApplicationActivationPolicyAccessory];
        // Здесь окна программы исчезают, пока не нажму на пункт в меню баре
    } else {
        [[NSUserDefaults standardUserDefaults] setBool:NO forKey:NVHideDockIcon];
        [NSApp setActivationPolicy:NSApplicationActivationPolicyRegular];
    }
}