"Restore" button in title bar not displayed correctly when application starts maximized

[floele-ww]

When the application starts with maximized window, the "restore" button is not displayed correctly (missing borders).

Example:

To reproduce: Modify the TestWindow class as shown below. This code is required because otherwise the window might appear on the wrong screen (see http://stackoverflow.com/questions/3121900/how-can-i-make-a-wpf-window-maximized-on-the-screen-with-the-mouse-cursor).

    public TestWindow()
    {
        this.InitializeComponent();

        window.SourceInitialized += (s, a) => window.WindowState = System.Windows.WindowState.Maximized;
    }

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Environment

• Fluent.Ribbon: Downloaded from Githib today
• Windows 10
• .NET Framework 4.6