@Override
	public boolean showWindow( Window window, int cmd ) {
		WndProc wndProc = windowsMap.get( window );
		if( wndProc == null )
			return false;

		User32.INSTANCE.ShowWindow( wndProc.hwnd, cmd );
		return true;
	}
Tell the window whether the application wants to use custom decorations.
If {@code true}, the Windows 10 title bar is hidden (including minimize,
maximize and close buttons), but not the resize borders (including drop shadow).
flatlaf-natives/flatlaf-natives-jna/src/main/java/com/formdev/flatlaf/natives/jna/windows/FlatWindowsNativeWindowBorder.java