WPF WindowChrome WindowsFormsHost: Opacity

Question

since WPF has no month calendar that allows displaying multiple months I am trying to use the classic WindowsForms MonthCalendar inside a WindowsFormsHost. Doing this in a "normal" WPF window works fine. I am trying to use a templated window with WindowChrome. The result looks like the MonthCalendar has an opacity value of 0.5 although it hasn't (left/first picture) In the VS designer it looks as expected (right/second picture)

How can I get rid of this effect?

Answer 1

<WindowChrome GlassFrameThickness="0"/>

If your GlassFrameThickness is set to -1 (or some other value that results in the inner glass border being large enough to underlay the control) the WindowsFormsHost picks up the glassy transparency.