WPF Ribbon Window - With No Resize Style

There is a weird border at the bottom of my WPF Ribbon Window. It only occurs when I set the RibbonWindow's ResizeMode to NoResize. How do I get rid of the line at the bo开发者_运维知识库ttom?

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I can't reproduce this right with my version, but I would try to set the ResizeMode to NoResize after the loaded-event of the RibbonWindow. It should ensure that a first layout pass has been done before setting the value.

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Ensure that WindowStyle property of the RibbonWindow is set as SingleBorderWindow. Hope that helps.